11% of high school seniors said they were using marijuana every day. 1975: About 27% said they had used marijuana sometime in the previous month. 1978: The monthly users grew up to 37% then in 1986 dropped to 23%. 1979: 12 to 17 year olds reported using it within the last month has dropped from a high point of 17% and in 1987 dropped to 12%. ...
