Outcomes
SENSITIVITY
Supplementary Table Withdrawal symptoms related to cigarettes were assessed before and after use of the NVP/HTP product. We used a question derived by the Mood and Physical Symptoms Scale (MPSSProduct satisfaction:For assessing acute positive effects of NVP/HTP after their use, 14 items based on previous researchTo assess adverse side-effects of NVP/HTP immediately after their use, 21 items based on previous studyIntention to switch to NVP/HTPParticipants were asked to rank how likely they were to switch to NVP after NVP use, and how likely they were to switch to HTP after HTP use, on a 4-point Likert scale (0 = ‘very unlikely’ to 3 = ‘very likely’).Perceptions about NVPs/HTPs compared with cigarettesParticipants were asked after product use compared with cigarettes (i) whether they think the NVP/HTP is safe, (ii) whether the NVP/HTP is addictive, and (iii) how satisfying is NVP/HTP. People could respond “don’t know” to the first two above questions. In the main analysis ‘don’t know’ answers were excluded. Sensitivity analysis included individuals with ‘don’t know’ responses and this option was placed in between the most popular response options of each product to have the least biasing impact on results.AttitudesParticipants were asked after product use (i) whether they found the product helpful in enabling them to refrain from smoking, (ii) how pleasant they found the product to use, (iii) how embarrassing they found the product to use in the company of others, (iv) whether they would recommend the product to a friend who wanted to stop smoking, (v) whether they would use the product outdoors, (vi) indoors at home, (vii) indoors at work/public spaces.Reasons that would motivate switching from cigarettes to NVPs/HPTsParticipants were asked to indicate the importance of the following nine reasons in motivating them to switch from cigarettes to NVP/HTP after using the products. If the product (i) ’is satisfying’, (ii) ‘is less smelly (than cigarettes)’, (iii) ‘is being used by friend(s)’, (iv) ‘helps to manage stress’, (v) ‘is less harmful than cigarettes’, (vi) ‘is less harmful to other people around’, (vii) ‘can be used in smoke-free areas’, (viii) ‘can help to stop smoking’, (ix) ‘can help to cut down smoking’.All responses were normalised on 0% to 100% scale, with higher values indicating higher endorsement of the items, and all measures have been used in previous research