Started my own business nearly 30 years ago and was always a heavy social drinker (but it never once interfered with my productivity.
Tried weed a few years ago and have cut WAY back on my drinking. No more hangovers, better sleep, more focus, etc.
Marijuana comes up occasionally in casual conversation among my friends that also run companies and I was surprised to learn how many imbibe on a fairly regular basis.
I calmly contrasted alcohol vs. weed to my parents ("We're shocked! But, you're so smart!") thusly:
Mom, when you go out for dinner and drinks, it takes you two or three martinis to feel the way you want to feel. It also takes a couple hours and about $30. I can take two drags off my over-sized hitter for about fifty cents and feel even better than you in about one minute with zero hangover. Moreover, if I stop, I'll be sober as a judge in about an hour.
My side effects when stoned? I'm calm, focused, happy, hungry and horny.
Mom and dad never said another word.