Kids have been smoking pot and cigarettes from grade 7/8. I remember my parents freaking out when I used to come home high and could smell it, lol. They couldn't do much because it happened during school hours / on the way to school, or on the way home. Even if they dropped me off or picked me up, they weren't around me all the time, and the switching school and environments wouldn't work because it was even mainstream and easily accessible back then. I will say that education and proper rules (only doing it on weekends, cannot do it on our property) might help. All of my friends who have smoked since high school are very successful and never had issues graduating etc. I do know people who over-consume or need to consume it to survive, which is a different story.