Baseline Participant Characteristics by Study Group
GROUP B
Group A was the fully enhanced group, exposed to the machine learning recommender computer-tailored motivational texting intervention (ML recommender) and viral peer-recruitment tool kit (viral tool kit). Group B was exposed to the ML recommender with no viral tool kit. Group C was exposed to the standard motivational texting intervention (standard messaging) with viral tool kit. Group D was exposed to standard messaging with no viral tool kit.American Indian or Alaska Native, Asian, and Native Hawaiian or other Pacific Islander individuals were combined as other race due to low sample sizes.Maximum number of baseline cigarettes per day was set at 75 cigarettes given that there were 3 outliers reporting more than 100 cigarettes/d.In H1, the fully enhanced group (A) had significantly increased quit rates compared with the group exposed to the ML recommender with no access to the viral tool kit (B) (89 of 205 participants [43.4%] vs 57 of 207 participants [27.5%] with outcome data; adjusted odds ratio [aOR], 1.91; 95% CI, 1.20-3.03) (