I started drinking at 20 and smoked weed around 25ish...I was never much of a ladies' man, but of all the girls I've dated I slept with only half of them and had more one night stands than girlfriends. Never smoked a cigarette in my life and never tried anything more than weed and unintentional huffing (painting in areas without proper ventilation).
Only thing that keeps me from regular marijuana use is I like guns and have my conceal carry permit...if I got caught using mj, even medical mj, I could lose the right to own/carry guns. For now, guns are more important.
Nowadays, I've calmed down...I drink very rarely and when I do, it's only a drink/shot or three. When I used to drink regularly, I would always wake up with stories I shouldn't have been proud of.......
Don't use any other drugs and my fiancee would kill me if I was dating anyone else so I guess my rules are very similar to my teenage years, I just had to try everything first. LOL
Disclaimer: Please do not follow me into any trades without verifying their potential for yourself. While I often feel like I have a good handle on things, my track record says differently.....