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Cigarette and e-cigarette use was measured by asking participants: Have you used regular cigarettes? and Have you used e-cigarettes? with responses Yes, in the past 30 days, Yes, in the past year, but not in the past 30 days, and Yes, but not in the past year/No, I have not

Briefly, the studies that were extracted represented several types of study design (for example, cohort and casecontrol studies), measured exposure in several different ways and varied in their choice of reference categories (where some compared current smokers with never smokers, whereas others compared current smokers with nonsmokers or former smokers)

A list of names and plot numbers is posted at the gate

Jarvis, M.J., Boreham, R., Primatesta, P., Feyerabend, C., Bryant, A., 2001

Faith No More Who Cares a Lot