here's what I know about myself...I smoked a lot, didn't do well in school, way under achieved, smoked much less, did better in college and grad school...then quit altogether when we had kids...over 21 years ago. And in my case it did lead to much more than just weed. But, I decided it interfered with my life too much and didn't want it to get in the way of my family.
For as much I did and experienced, I am worried about my kids doing that stuff and would hope they never would do it...but I'm realistic.