Feasibility and Preliminary Effects of a Social Media–Based Peer-Group Mobile Messaging Smoking Cessation Intervention Among Chinese Immigrants who Smoke: Pilot Randomized Controlled Trial

Background: Chinese immigrants experience significant disparities in tobacco use. Culturally adapted tobacco treatments targeting this population are sparse and the use is low. The low use of these treatment programs is attributed to their exclusive focus on individuals who are ready to quit and the wide range of barriers that Chinese immigrants face to access these programs. To support Chinese immigrant smokers at all levels of readiness to quit and address their access barriers, we developed the WeChat Quit Coach, a culturally and linguistically appropriate WeChat (Tencent Holdings Limited)–based peer group mobile messaging smoking cessation intervention. Objective: This study aims to assess the feasibility, acceptability, and preliminary effects of WeChat Quit Coach. Methods: We enrolled a total of 60 Chinese immigrant smokers in 2022 in New York City for a pilot randomized controlled trial (RCT) and a single-arm pilot test. The first 40 participants were randomized to either the intervention arm (WeChat Quit Coach) or the control arm (self-help print material) using 1:1 block randomization stratified by sex. WeChat Quit Coach lasted 6 weeks, featuring small peer groups moderated by a coach, daily


Introduction
The prevalence of smoking has declined significantly in the United States over the past 50 years [1].However, smoking rates remain disproportionately high in socioeconomically disadvantaged populations, including Chinese immigrants (foreign-born Chinese Americans).In New York City (NYC), the city with the largest Chinese immigrant population in the United States, 28% of Chinese American men smoke compared with 18% of the total NYC men [2].Chinese immigrants, accounting for 68% of the NYC Chinese American population, are more likely to smoke than US-born Chinese Americans (New York City Department of Health and Mental Hygiene, unpublished data, 2018).
Culturally adapted tobacco treatments for Chinese immigrants are sparse [3,4] and the use is low.For example, the National Asian Smokers' Quitline (ASQ) engages only about 2000 Asian American callers nationwide annually (the number of Chinese-speaking callers is unknown) [5].The low use of tobacco treatment programs is attributed to 2 major reasons.First, current tobacco treatment programs are designed to offer cessation support to individuals who are ready to quit smoking (ie, they plan to quit within a month).However, only 6%-33% of Chinese Americans who smoke are ready to quit [6][7][8].This is largely due to the limited knowledge about the harms of smoking, strong attachment to traditional Chinese prosmoking norms, lack of behavioral capability for quitting, limited social support to facilitate cessation, and low self-efficacy [9][10][11][12][13].Current tobacco treatment programs often provide no support to move the vast majority of individuals not ready to quit to the stage of being ready to quit.Second, Chinese immigrants have limited access to evidence-based tobacco treatments.Access barriers include limited awareness of treatment resources, skepticism about treatment effects, and time and economic constraints [9][10][11]14,15].Less than 20% of Chinese American smokers who attempt to quit use pharmacotherapy or behavioral interventions [7,16].Research is needed to explore intervention strategies that can engage a broad group of Chinese immigrant smokers, including those not ready to quit, and address the wide range of barriers to cessation.
Over the past decade, social media has been increasingly studied as a tool for tobacco treatment.Social media can reach large populations, allow users to access at their own time of convenience with low or no cost, and may alleviate access barriers to tobacco treatment.A total of 2 systematic reviews have provided evidence supporting the feasibility and acceptability of social media-based smoking cessation interventions [17,18].In addition, 2 randomized controlled trials (RCTs) conducted among English-speaking smokers compared social media-based tobacco treatment with other cessation support [19,20].Both interventions feature peer group messaging support, with mixed findings, for example, a Facebook (Meta)-based intervention resulted in abstinence rates comparable to the control at 3, 6, and 12 months [19], whereas a Twitter-based intervention yielded a higher abstinence rate than the control on day 60 [20].
A total of 3 RCTs among Chinese-speaking smokers in Hong Kong [21] and mainland China [22,23] compared WhatsApp (Meta)-based or WeChat (Tencent Holdings Limited)-based interventions with usual cessation care or no tobacco treatment, all using a one-on-one intervention model.A WhatsApp-based intervention led to higher abstinence than the control at 6 months (8% vs 5% biochemically validated 7-day point prevalence abstinence) [21].A WeChat-based intervention also produced higher abstinence than the control at 26 weeks (12% vs 3% biochemically validated continuous abstinence) [23], but the trial only included individuals ready to quit.Another trial of a WeChat-based intervention did not report any abstinence outcomes [22].Thus far, the impact of using social media to engage and treat smokers, particularly those not ready to quit, is still unclear.
To reduce tobacco use among Chinese immigrants, our multidisciplinary team developed a culturally and linguistically appropriate social media intervention named WeChat Quit Coach for Chinese immigrants who smoke, across all levels of readiness to quit.Informed by the social cognitive theory and the socioecological model, WeChat Quit Coach addresses multilevel barriers to cessation [24].The intervention features small, private peer groups moderated by a coach, daily WeChat text messages with text questions, and chat-based instant messaging support from the coach responding to peer questions.By using WeChat, the most widely used social media platform among Chinese with approximately 1.3 billion monthly active users worldwide [25], WeChat Quit Coach holds the potential to reach a large population of Chinese immigrants.In our previous study, we found that 94% of Chinese immigrants who smoke in NYC use WeChat, and that WeChat is used more frequently than other platforms, including Facebook, Twitter, WhatsApp, Line (Line Corporation), and short messaging [10].This study sought to assess the feasibility, acceptability, and preliminary effects of WeChat Quit Coach among Chinese immigrants who smoke.

Ethics Approval
The study was approved by the Institutional Review Board of New York University Grossman School of Medicine (i20-01959) and preregistered at ClinicalTrials.gov(NCT05130788).

Study Design
As shown in Figure 1, we conducted an open-label, 2-arm pilot RCT and a single-arm pilot test among 60 participants.The first 40 participants were enrolled in the pilot RCT.To obtain more data on feasibility and acceptability, we enrolled an additional 20 participants in a single-arm pilot test.

Participants and Recruitment
Participants were recruited from February to December 2022, primarily in 3 NYC communities that have high concentrations of Chinese immigrants, including Flushing (Queens, NY), Sunset Park (Brooklyn, NY), and Chinatown (Manhattan, NY).Inclusion criteria included (1) self-identified as a Chinese immigrant; (2) age ≥18 years; (3) had smoked at least 100 cigarettes in their lifetime; (4) smoked ≥3 days per week; (5) used WeChat ≥3 days per week; (6) able to read Chinese; (7) lived in NYC; and (8) was somewhat interested in quitting, which was assessed by a question, "Which statement best describes your intention to quit? (A) I don't want to quit at all; (B) I may quit at some point, but not within the next 6 months; (C) I plan to quit within the next 6 months; (D) I plan to quit within the next 30 days; (E) I am trying to quit."People who chose an answer other than "A" were considered to be somewhat interested in quitting.Exclusion criteria included (1) current participation in other tobacco treatments, (2) pregnancy or breastfeeding, and (3) inability to connect with research staff through WeChat.
In collaboration with community-based organizations (CBOs), we disseminated study flyers at community events (eg, CBOs' workshops, health fairs, and immigrant resource fairs) and posted flyers in CBOs' offices and on their WeChat accounts.The flyer contained information about the study purpose, a study WeChat QR code, and a study phone number.In addition, CBOs and study participants referred potential participants to the research staff.
Potential participants contacted our research staff by scanning the study WeChat QR code or calling the study number.The research staff conducted eligibility screenings over the phone and arranged an in-person study visit for eligible individuals.At the visit, the research staff administered the written consent process and a paper-and-pencil baseline survey.The first 40 participants were enrolled in the pilot RCT.The subsequent 20 participants were enrolled in the single-arm pilot test.

Randomization
A total of 40 participants were randomized to the intervention or control arm (n=20 per arm) using block randomization stratified by sex (male or female).A randomization module was created and uploaded into REDCap (Research Electronic Data Capture).The research staff performed the allocation.Participants and research staff were unblinded to the assignment.

Intervention Arm
The research staff created a WeChat peer group every other month.Each group comprised of participants newly enrolled during the 2-month period who were either randomized to the intervention arm or enrolled in the single-arm pilot test (4-10 participants per group), along with a coach (NJ) and a research assistant.During the 6-week intervention period, the coach sent a WeChat text message to the group every day at 9 AM.The messages aimed to (1) enhance motivation to quit by building awareness about the health effects of smoking, quitting methods (eg, quitting preparation and relapse prevention) and cognitive or behavioral tips (eg, coping and refusal strategies), and available Chinese-language tobacco treatment programs (eg, ASQ and local smoking cessation programs); (2) challenge social norms that perpetuate smoking by denormalizing cigarette sharing culture and highlighting the fact that most Chinese immigrants do not smoke; (3) improve self-efficacy through motivational contents and tips for handling slips; and (4) encourage NRT use by addressing misconceptions.Details about the development process of WeChat Quit Coach are available elsewhere [24].
Following the daily WeChat text message, a text question was sent to the WeChat group each day to promote engagement (eg, "What is the longest period you've stayed abstinent in previous quit attempts?").Participants were encouraged to respond daily and ask their own questions either in the group or directly to the coach, who responded within 24 hours.Figure 2 shows a screenshot of the intervention.If a participant did not respond for 3 consecutive days, a reminder message was sent to him or her through WeChat by the research assistant.Each participant received up to 3 reminders during the intervention.Participants could comment on others' responses and withdraw from the intervention at any time.The research assistant moderated peer interactions and monitored engagement.

Control Arm
Participants allocated to the control arm received a leaflet with information about pharmacotherapy and behavioral interventions for smoking cessation, including the ASQ and local Chinese-language tobacco treatment programs.

NRT Supply
All 60 participants were offered a 4-week supply of free nicotine patches and lozenges.The participants could request NRT medications by texting the study WeChat account or calling the study number, with research staff screening for contraindications over the phone.If no contraindication was reported, participants were recommended a combination of nicotine patches and lozenges with doses as per package instructions.Participants could choose the form (eg, patch, lozenge, or both) and request XSL • FO RenderX a lower dose.NRT medications and an instruction sheet (Chinese version) were then delivered by mail or in person.

Key Measures
Primary outcomes included feasibility, engagement, and acceptability.Feasibility was measured by eligibility rate (defined as the proportion of individuals screened who were eligible), enrollment rate (the proportion of eligible individuals who enrolled), follow-up rate (the proportion of participants who completed follow-up assessment at each time point), and the number of withdrawals.Engagement and acceptability were assessed at 6 weeks among participants from the intervention arm and the single-arm pilot test.Engagement was defined as the number of days participants responded to text questions and the number of participants who posted their own questions for instant messaging support.Acceptability was assessed through Likert scale questions regarding participants' perceptions about the intervention (eg, the timing of text messages and length of the intervention), helpfulness of intervention components (ie, text messages, text questions, and chat-based instant messaging support), overall satisfaction, and willingness to recommend it to others.Secondary outcomes, assessed at 6 weeks and 6 months in the pilot RCT, included self-reported and biochemically verified 7-day point prevalence abstinence (yes or no).Participants reporting abstinence in the past 7 days were invited to participate in an exhaled CO test administered by research staff.A CO concentration of ≤6 parts per million indicated biochemically verified abstinence [26].Additional outcomes encompassed quit attempts (yes or no; defined as no smoking for at least 24 hours because of trying to quit), change in smoking knowledge score, progression to a more advanced stage of change (yes or no), NRT use (yes or no), and use of other tobacco treatment (yes or no).Smoking knowledge was assessed using a 5-item measure adapted from the Global Adult Tobacco Survey [27], "Based on what you know, does smoking cigarettes cause (1) respiratory diseases, (2) lung cancer, (3) coronary heart disease, (4) stroke, (5) diabetes?"(0="no" or "not sure"; 1="yes").The score of smoking knowledge was the sum of the points (ranging between 0 and 5).The stage of change was assessed by a question "Which statement best describes your plan about quitting?" with answer options of 1="I am not interested in quitting at all" (precontemplation), 2="I may quit in the future, but not in the next 6 months" (precontemplation), 3="I plan to quit within the next 6 months" (contemplation), 4="I plan to quit within the next 30 days" (preparation), and 5="I am trying to quit now" (action).Participants reporting a more advanced stage of change at follow-up, compared with baseline, were deemed to have transitioned to a more advanced stage.
Other measures included sociodemographic characteristics (eg, age, gender, education, birth country, years of residence in the United States, marital and employment status, and household income level), smoking behaviors (eg, age of smoking initiation, number of smoking days per week, cigarette consumption per day, time to first cigarette in the morning, and current use of other tobacco products), quitting experience (eg, quit attempts in the past 12 months, reasons for past quit attempts, and quitting methods ever used), and smoke-free home rule ("Which statement best describes the rule about smoking inside your home?(1) Smoking is not allowed anywhere in my home [complete rule]; (2) Smoking is allowed in some places or at some times in my home [partial rule]; (3) Smoking is allowed anywhere in my home [no rule]; (4) There are no rules about smoking in my home [no rule]" [28]).

Statistical Analysis
We performed descriptive statistics to summarize the variables of interest.Secondary outcomes were assessed using an intention-to-treat approach, with missing data treated as no change compared with baseline.To compare the differences between intervention and control arms, effect size estimates were computed, including odds ratios for categorical variables (eg, self-reported and biochemically validated abstinence) and Hedges g for the continuous variable (ie, smoking knowledge score) and their 95% CIs.For variables containing zero count cells, odds ratios and 95% CIs were not reported.All data analyses were performed using Stata 17 (StataCorp LLC).

Engagement and Acceptability
On average, participants responded to WeChat text questions on 25.1 (SD 11) days out of 42 days (median 26.5, IQR 19-33 days).Reportedly, 9 out of 40 participants (23%) sent their own questions to receive chat-based instant messaging support from the coach.In total, 3 out of 40 participants (8%) interacted with peers.One of the participants commented on another's responses to a text question, while 2 participants each posted a message to communicate with the entire peer group.

XSL • FO
RenderX enjoyable to answer text questions.Of the 9 who sent their own questions for instant messaging support, 7 participants (78%) reported such support was helpful.

Daily text messages
Timing of text messages

Cessation Outcomes
At 6 weeks, 20% (4/20) of intervention participants reported 7-day point prevalence abstinence and were validated biochemically (Table 3).None of the control participants reported abstinence.At 6 months, 25% (5/20) of intervention participants reported abstinence and were validated, while 15% (3/20) of control participants reported abstinence and only 5% (1/20) were validated.a For categorical variables, we computed the odds ratio and its 95% CI; for the continuous variable, we computed the Hedges g and its 95% CI.Compared with baseline, intervention participants showed an average increase of 1.6 (SD 1.6) points in smoking knowledge at 6 weeks, while the score remained unchanged (mean -0.

Discussion
This is the first study of a social media-based smoking cessation intervention targeting Chinese immigrants.The sociodemographic characteristics of our participants correspond to the overall population traits of Chinese immigrants in NYC, including low income and low education [29].The study demonstrates the feasibility and acceptability of a WeChat-based smoking cessation intervention and shows promising early efficacy on biochemically verified abstinence at 6 months.
It was found that 70% (42/60) of the participants were in the precontemplation or contemplation stage at enrollment.It suggests that the intervention is attractive to participants, including those not determined to quit in the near term.WeChat Quit Coach targets individuals at all levels of readiness to quit and is implemented through a platform deeply integrated into the daily lives of Chinese immigrants.The intervention has the potential to extend the reach of tobacco treatment within this population.
WeChat Quit Coach created favorable user experiences, as indicated by high levels of acceptability and engagement.Participants were overwhelmingly satisfied with the intervention.The interaction feature (daily text questions) was deemed enjoyable and helpful overall, resulting in a high engagement level compared with other social media peer group cessation interventions [20,30].It is encouraging that participants post their own questions to receive instant messaging support, resulting in a usage rate (23%) comparable to that of a WhatsApp-based one-on-one cessation intervention for smokers in Hong Kong, which also features instant messaging support (17%) [21].The results suggest that our intervention generally aligns with the needs of Chinese immigrant smokers.In total, 8 of the 39 participants (21%) reported the intervention was too short, highlighting opportunities for further refinement.
WeChat Quit Coach appears to be promising in promoting abstinence, with a biochemically verified abstinence rate of 25% at 6 months, which is higher than those reported in previous trials of social media interventions for Chinese-speaking smokers in Hong Kong (8% vs 5% biochemically validated 7-day point prevalence abstinence at 6 months [21]) and China (12% vs 3% biochemically validated continuous abstinence at 26 weeks [23]).Other outcomes, including quit attempts and smoking knowledge, were also higher in the intervention arm than control.Larger trials are needed to evaluate the impact of such intervention on abstinence among Chinese immigrants.
A noteworthy finding is that 55% (11/20) of intervention participants and 70% (14/20) of control participants reported NRT use.The high use of NRT could be attributed to the availability of complimentary NRT and the convenient process to request NRT.Chinese immigrants have limited awareness and hold widespread misconceptions about NRT despite its over-the-counter availability [10,14].Moreover, Chinese immigrants have a high poverty rate compared with immigrants overall in the United States [31].These factors contribute to the underuse of NRT.Our study indicates that Chinese immigrant smokers are receptive to using NRT when access barriers (eg, cost) are minimized.Our intervention might be more successful in promoting NRT use if cues to try NRT were added to our message library.This study has several strengths.It is the first to explore a social media-based smoking cessation intervention for Chinese immigrants, a disadvantaged population with high smoking rates.It tests an innovative intervention using a culturally appropriate platform.The study fills gaps in research on tobacco-related disparities and the application of mobile technology for tobacco treatment.It also benefits from the inclusion of both individuals who are ready to quit and those not ready to quit, high follow-up rates, biochemically validated abstinence, and provision of NRT.This study has several limitations.First, as a pilot study aiming to test the feasibility, acceptability, and preliminary effects of our intervention, it was not adequately powered to assess treatment efficacy on abstinence.Second, participants were recruited from NYC, thus limiting the generalizability of our findings to other geographic regions.
This study supports the feasibility of a WeChat-based smoking cessation intervention for recruiting Chinese immigrant smokers across different levels of readiness to quit.The high levels of engagement, acceptability, and promising abstinence outcomes suggest that the intervention may be viable for this population.Larger trials are warranted to determine its efficacy.

Figure 2 .
Figure 2. A screenshot of the WeChat Quit Coach intervention.

a
Unhelpful or very unhelpful "In general, the messages are easy to understand."Dissatisfied or very dissatisfied Agree or strongly agree with the statements 35 (90) "It makes me want to quit smoking."32 (82) "It is helpful for quitting smoking."32 (82) "It makes me feel more confident that I can quit."Participants, n (%) Perceptions 34 (87) "It makes me feel I knew how to quit." 30 (77) "It makes me want to try again if a quit attempt is unsuccessful."Among participants who sent in their own questions to receive chat-based instant messaging support (n=9).
b OR: odds ratio.c Not applicable.d Compared with baseline.e NRT: nicotine replacement therapy.
3, SD 1 points) for control participants.At both follow-up time XSL • FO RenderX points, more intervention participants reported quit attempts and progressed to a more advanced stage of change, while more control participants requested NRT during the study period than intervention participants (17/20, 85% vs 16/20, 80%; data not shown in tables) and reported NRT use at both follow-ups (14/20, 70% vs 11/20, 55%).