Confusion and controversy related to the potential for cannabis use to cause harm, or
alternatively to provide benefit, continues globally. This issue has grown in intensity and …

Background Retaining participants in cohort studies with multiple follow-up waves is difficult.
Commonly, researchers are faced with the problem of missing data, which may introduce …

BACKGROUND: Cigarettes have been strongly associated with subsequent marijuana use
among adolescents, but electronic cigarettes (e-cigarettes) are now rapidly replacing …

We apply latent transition analysis (LTA) to characterize transitions over time in substance
use behavior profiles among first-year college students. Advantages of modeling substance …

Observational studies have linked cannabis use to an array of negative outcomes, including
psychiatric symptoms, cognitive impairment, and educational and occupational …

PURPOSE: There has been an increase in the abuse of prescription opioids, especially in
younger individuals. The current study explores the association between alcohol, cigarette …

Early onset of alcohol, marijuana, and cigarette use is an indicator of later substance use
problems in adulthood such as alcohol or other drug dependence. This paper seeks to …

Specific provisions of legal cannabis legislation and regulation could influence cannabis
initiation, frequency and quantity of use, and progression to cannabis use disorder. This brief …

Objectives. To examine changes in age of initiation of e-cigarette, cigarette, cigar, and
smokeless tobacco use among adolescents in the United States. Methods. We used data …

INTRODUCTION AND AIMS: To examine differences in the characteristics and histories of
male and female dependent heroin users, and in the clinical characteristics associated with …