They were 18-20 years old when asked about marijuana use.

And it's not just marijuana use, which has increased by 141 percent.

Consider what has just happened on the issue of marijuana use for medical purposes.

Fully 62 percent of the need for treatment is due to marijuana use.

He added that the inquiry had also found no evidence of marijuana use.

If this is the case, there certainly will be more long-term effects of marijuana use.

Consider the rates of current marijuana use by young people here and abroad.

He first tested positive, for marijuana use, in February 1988.

The report also noted a 12 percent drop in marijuana use among all age groups since 1988, when a similar survey was taken.

As a result, almost no public drinking or marijuana use was apparent.