I think you'd be surprised how many people smoke weed in high school. If I had to estimate I'd say that over half of my class smoked (including the class president and valedictorian) and probably close to 20% smoked on a daily basis. The parking lot literally reeked of weed every morning. Did everyone turn out ok? No but the vast majority of them did. Plenty of my aforementioned classmates are now doctors, lawyers, scientists, etc. By a number of metrics, they are successful and very useful humans.