Discussion
RECRUITMENT
This randomized clinical trial examined 6-month smoking-cessation data among 1487 people enrolled in a digital smoking-cessation trial. Much of the effect in smoking cessation in our study may have been due to access to the viral peer recruitment tool kit, as our H2 results suggested. Viral peer recruitment draws strength from the constructs of relatedness as proposed in self-determination theory.There could be several reasons for the H3 null finding. We were comparing the recommender system against a robust standard messaging system that was proven effective in a prior trial.