Table 1 Population, intervention, comparator and outcome inclusion criteria for review question

Population

Adolescents who never smoked tobacco cigarettes at baseline. The age of the included population was between 13 and 19 years at baseline. The could be living in any country around the Globe.

Exposure

Any e-cigarette vaping at baseline or in the past

Comparators

Non-electronic cigarette user

Outcomes

Initiation of tobacco cigarette smoking at follow-up

Study design

Longitudinal cohort studies

Search dates

2005–2019