Coronary disease & ACSCohort study
Occasional smoking is a risk factor for myocardial infarction in the population-based Tromsø Study, 2001–21
- Prospective cohort study
- population-based
Authors' conclusion
This study highlights an elevated risk of MI among occasional smokers, with higher relative risk in women.
Study context
- Population
- Participants of the 5th and/or 6th survey of the Tromsø Study, Norway9.2% occasional smokers
- Participants
- 15,617 participants
- Exposure
- Occasional smoking vs never smoking
- Outcome
- First-time myocardial infarction (MI)
- Follow-up
- 2001–2021
Main finding
First MI (1297 events)
Hazard ratio
1.41
95% CI 1.11–1.80
Occasional smokers vs Never smokers
HR 1.41 (95% CI 1.11–1.80)
As reported in the abstract
Observational data: associations, not effects.
Further findings
| Outcome | HR (95% CI) | |
|---|---|---|
| First MI, occasional vs never smokers, by sex (subgroup) — Occasional smokers vs Never smokers · women | 2.08 (1.43–3.04) | |
| First MI, occasional vs never smokers, by sex (subgroup) — Occasional smokers vs Never smokers · men | 1.11 (0.81–1.52) | |
| 0.20.5125Hazard ratio (log scale) |
Original publication
Occasional smoking is a risk factor for myocardial infarction in the population-based Tromsø Study, 2001–21. Eur J Prev Cardiol. Published 27 March 2025. doi:10.1093/eurjpc/zwaf182
Summarised from the published abstract; every number is checked against it