RT Journal Article SR Electronic T1 Randomised controlled trial of tailored support to increase physical activity and reduce smoking in smokers not immediately ready to quit: protocol for the Trial of physical Activity-assisted Reduction of Smoking (TARS) Study JF BMJ Open JO BMJ Open FD British Medical Journal Publishing Group SP e043331 DO 10.1136/bmjopen-2020-043331 VO 10 IS 12 A1 Taylor, Adrian A1 Thompson, Tom P A1 Ussher, Michael A1 Aveyard, Paul A1 Murray, Rachael L A1 Harris, Tess A1 Creanor, Siobhan A1 Green, Colin A1 Streeter, Adam Justin A1 Chynoweth, Jade A1 Ingram, Wendy A1 Greaves, Colin J A1 Hancocks, Helen A1 Snowsill, Tristan A1 Callaghan, Lynne A1 Price, Lisa A1 Horrell, Jane A1 King, Jennie A1 Gude, Alex A1 George, Mary A1 Wahlich, Charlotte A1 Hamilton, Louisa A1 Cheema, Kelisha A1 Campbell, Sarah A1 Preece, Dan YR 2020 UL http://bmjopen.bmj.com/content/10/12/e043331.abstract AB Introduction Smoking reduction can lead to increased success in quitting. This study aims to determine if a client-focused motivational support package for smoking reduction (and quitting) and increasing (or otherwise using) physical activity (PA) can help smokers who do not wish to quit immediately to reduce the amount they smoke, and ultimately quit. This paper reports the study design and methods.Methods and analysis A pragmatic, multicentred, parallel, two group, randomised controlled superiority clinical trial, with embedded process evaluation and economics evaluation. Participants who wished to reduce smoking with no immediate plans to quit were randomised 1:1 to receive either (1) tailored individual health trainer face-to-face and/or telephone support to reduce smoking and increase PA as an aid to smoking reduction (intervention) or (2) brief written/electronic advice to reduce or quit smoking (control). Participants in both arms of the trial were also signposted to usual local support for smoking reduction and quitting. The primary outcome measure is 6-month carbon monoxide-confirmed floating prolonged abstinence following participant self-reported quitting on a mailed questionnaire at 3 and 9 months post-baseline. Participants confirmed as abstinent at 9 months will be followed up at 15 months.Ethics and dissemination Approved by SW Bristol National Health Service Research Committee (17/SW/0223). Dissemination will include publication of findings for the stated outcomes, parallel process evaluation and economic evaluation in peer-reviewed journals. Results will be disseminated to trial participants and healthcare providers.Trial registration number ISRCTN47776579; Pre-results.