Tobacco use Mental and Behavioural Disorders Tobacco use
Conditions
Interventions
A randomised controlled trial in which smokers who routinely purchase cigarettes in pack sizes of 25 or more are randomised to one of two groups for a period of 4 weeks:
Group 1: Inter
Sponsors
University of Cambridge
Eligibility
Sex/Gender
All
Inclusion criteria
Inclusion criteria: 1. Aged 18 and over. 2. Smoke factory made cigarettes. 3. Smoke 5 or more cigarettes a day on every day of the week. 4. Smoked at least 100 cigarettes in his or her lifetime. 5. Routinely purchase cigarettes in packs of 25 or more. 6. Use a brand or brand variant in which cigarettes are available in pack sizes of 20 as well as sizes of one or more of the following: 25, 26, 30, 35, 40, 43 and/or 50. 7. Use a brand variant that is stocked in a pack size of 20 by at least one of the two major Australian supermarkets in the month before recruitment. 8. Live anywhere in Australia. 9. Able to read and write sufficient English to complete all study procedures. 10. Willing to collect and post one week of receipts of cigarettes purchased at baseline. 11. Willing to record on each cigarette pack dates when the pack was opened and when finished. 12. Willing to post weekly envelopes – on four consecutive weeks - containing all empty packs of cigarettes smoked in the preceding week with completed forms. 13. Willing to undergo a telephone interview at the end of the study.
Exclusion criteria
Exclusion criteria: 1. Pregnant women. 2. Intend to quit smoking in the next three months. 3. Used e-cigarettes weekly over the past month, and intend to continue. 4. Smoked roll-your-own (RYO) cigarettes once a week or more over the past month and intend to continue. 5. Normally transfer cigarettes into a case. 6. Don’t usually buy their own cigarettes. 7. Live in the same household as someone who has enrolled in the study. 8. Do not own a mobile phone or similar device with the ability to send photos via a text or email message. 9. Purchase their cigarettes with the intention of sharing half or more of them with another person.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| The primary outcome measure is the number of cigarettes smoked by participants in a four-week period. The primary outcome measure will be assessed from empty cigarette packs returned each week for four weeks, with a sticker on each pack completed by the participant stating: 1. Date pack started 2. Date pack finished 3. Number of cigarettes smoked from this pack 4. Number of cigarettes smoked by someone else from this pack 5. Number of cigarettes smoked from someone else’s pack during these dates 6. Rating of warning message (to fit with cover story) | — |
Secondary
| Measure | Time frame |
|---|---|
| Three secondary outcome measures will be taken at the point of recruitment via telephone and two weeks after completing procedures required for the primary endpoint (returning four weeks of empty cigarette packs) either by telephone or via an online survey. 1. Nicotine dependence will be measured by the Heaviness of Smoking Index (HSI) 2. Participants’ motivation to stop smoking will be measured by the Motivation to Stop Smoking scale (MTSS) 3. Participants’ autonomy over their smoking behaviour will be measured by the Autonomy Over Smoking Scale (AUTOS) | — |
Countries
Australia
Contacts
Public ContactTheresa Marteau
Outcome results
None listed