https://www.selleckchem.com/pr....oducts/scriptaid.htm
Association of electronic cigarette use and subsequent smoking has received considerable attention, although age of first use has not. This study tested differences in regular (e-cigarettes, cigarettes) and ever (cigarettes) use between e-cigarette user groups early versus never users, late versus never users, early versus late users and effects of controlling for covariates. Prospective study with 12- and 24-month follow-up of e-cigarette/cigarette ever/regular use with data from an intervention. Forty-five schools in England (Staffo
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