Efficacy and utilization of an acceptance and commitment therapy-based smartphone application for smoking cessation among Black adults: secondary analysis of the iCanQuit randomized trial

Abstract

Background and aims: Black adults who smoke are less likely to seek treatment and to succeed in quitting compared with other racial groups. The lack of efficacious and engaging trials for smoking cessation further contributes to this disparity. This study explored whether an acceptance and commitment therapy (ACT)-based smartphone application (iCanQuit) was more efficacious for smoking cessation than a United States Clinical Practice Guidelines (USCPG)-based smartphone application (QuitGuide) among Black adults.

Design: Secondary analysis of a two-arm randomized trial with 12-month follow-up.

Setting: United States (US).

Participants: A total of 554 Black adults who smoke daily were recruited from 34 US states and enrolled between May 2017 and September 2018.

Interventions: Participants were randomized to receive iCanQuit (n = 274) or QuitGuide (n = 280) for 12 months.

Measurements: Smoking cessation outcomes were measured at 3, 6, and 12 months. The primary outcome was self-reported complete-case 30-day point prevalence abstinence (PPA) at 12 months. Secondary outcomes were 7-day PPA, missing-as-smoking imputation, multiple imputation, prolonged abstinence, and cessation of all tobacco products at 12 months. Study retention, treatment engagement, and change in ACT-based processes were also compared between arms.

Findings: Study retention was 89% at 12 months and did not differ by arm (P > 0.05). The complete-case 30-day PPA was 28% for iCanQuit versus 20% for QuitGuide at 12 months (odds ratio [OR] = 1.60; 95% confidence interval [CI] = 1.03, 2.46). Similar associations were observed for the missing-as-smoking imputation, although non-significant (25% iCanQuit vs 18% QuitGuide; OR = 1.50; 95% CI = 0.98, 2.30). iCanQuit vs QuitGuide participants were significantly more engaged with iCanQuit application as measured by the number of logins from baseline to 6 months (incidence rate ratio = 3.26; 95% CI = 2.58, 4.13). Increased acceptance of cues to smoke mediated the effect of treatment on cessation (indirect effect: OR = 0.20; 95% CI = 0.05, 0.29).

Conclusions: Among Black adults, an acceptance and commitment therapy-based smartphone application appeared to be more efficacious and engaging for smoking cessation than the United States Clinical Practice Guidelines-based QuitGuide application.

Trial registration: ClinicalTrials.gov NCT02724462.

Keywords: Acceptance and commitment therapy; black adults; digital interventions; iCanQuit; smartphone applications; smoking cessation.

Conflict of interest statement

DECLARATION OF INTERESTS

None of the authors have declarations. None of the authors have a financial interest in the iCanQuit application.

© 2021 Society for the Study of Addiction.

Figures

FIGURE 1

CONSORT diagram. a To increase enrollment of American Indians or Alaska Natives and men, some Black individuals who were eligible for study enrollment were randomly selected to be excluded during a period when only American Indians or Alaska Natives were recruited. To increase enrollment of men, some women who were eligible for study enrollment, were randomly selected to be excluded. b Phone did not meet the version requirements or was unable to receive text messages

FIGURE 2

Geographic location of Black trial participants