Randomized controlled trial to assess the short-term effectiveness of tailored web- and text-based facilitation of smoking cessation in primary care (iQuit in practice).

Aims To estimate the short-term effectiveness, feasibility and acceptability of a smoking cessation intervention (the iQuit system) that consists of tailored printed and Short Message Service (SMS) text message self-help delivered as an adjunct to cessation support in primary care to inform the design of a definitive trial. Design A stratified two parallel-group randomized controlled trial comparing usual care (control) with usual care plus the iQuit system (intervention), delivered by primary care nurses/healthcare assistants who were blinded to the allocation sequence. Setting Thirty-two general practice (GP) surgeries in England, UK. Participants A total of 602 smokers initiating smoking cessation support from their local GP surgery were randomized (control n=303, intervention n=299). Measurements Primary outcome was self-reported 2-week point prevalence abstinence at 8 weeks follow-up. Secondary smoking outcomes and feasibility and acceptability measures were collected at 4 weeks after quit date, 8 weeks and 6 months follow-up. Findings There were no significant between-group differences in the primary outcome [control 40.3%, iQuit 45.2%; odds ratio (OR)=1.22, 95% confidence interval (CI)=0.88-1.69] or in secondary short-term smoking outcomes. Six-month prolonged abstinence was significantly higher in the iQuit arm (control 8.9%, iQuit 15.1%; OR=1.81, 95% CI=1.09-3.01). iQuit support took on average 7.7 minutes (standard deviation=4.0) to deliver and 18.9% (95% CI=14.8-23.7%) of intervention participants discontinued the text message support during the programme. Conclusions Tailored printed and text message self-help delivered alongside routine smoking cessation support in primary care does not significantly increase short-term abstinence, but may increase long-term abstinence and demonstrated feasibility and acceptability compared with routine cessation support alone.