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According to the latest federal figures, which were part of an annual survey, Monitoring the Future, more than 12 percent of eighth graders and 36 percent of seniors at public and private schools around the country said they had smoked marijuana in the past year. About 60 percent of high school seniors said they did not view regular marijuana use as harmful, up from about 55 percent last year.

The report looked at a wide variety of drugs and substances. It found, for example, that drinking was steadily declining, with roughly 40 percent of high school seniors reporting having used alcohol in the past month, down from a peak of 53 percent in 1997. Abuse of the prescription painkiller Vicodin is half what it was a decade ago among seniors; cocaine and heroin use are at historic lows in almost every grade.

Cigarette smoking has also fallen precipitously in recent years. For the first time since the survey began, the percentage of students who smoked a cigarette in the past month dropped below 10 percent. Roughly 8.5 percent of seniors smoke cigarettes on a daily basis, compared with 6.5 percent who smoke marijuana daily, a slight increase from 2010.

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– http://well.blogs.nytimes.com/2013/12/18/growing-marijuana-use-among-teenagers-spurs-concerns/?ref=todayspaper