Due to recent evidence of the increasing frequency of marijuana use among adolescents and young adults, and due to the many remaining research issues regarding this drug, it is appropriate to summarize some of the important data about marijuana and to suggest some directions for research and service. This article first provides a review of the history, botany, active ingredients, effects, and negative consequences of marijuana use. Next, prevention and cessation of marijuana use are discussed. Finally, this paper provides a selective examination of current issues in marijuana research. Several salient issues are highlighted including its preference among certain subgroups (high risk youth and ethnic differences), its relations with illegal behavior (marijuana use and driving, current marijuana-related legislation, and marijuana use and violence), and its recent portrayal in the media.
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