Poll coming, but really, I have 3 reasons, with the main one being it isn't legal where I live....
I am 52, and 30+ years ago, I did smoke it often, for about 2 years, and then one day I just decided to give it up...... smoked it one time since then. If it was legal where I live, I might smoke it a few times a year, but no more than that. I also don't smoke it because I want to be a positive influence on my kids. My twins are 13 years old, and have never even seen me get drunk.... which I only do about once a year, and usually while on vacation.
And finally, I probably am too cheap to buy it. I wouldn't even want more than one J at a time, and as I understand it, people who sell it would never sell that quantity, and I wouldn't buy more than that. I don't even know what it costs anyway.
But I hope it eventually becomes legal in my state, as too many people go to jail for this. And while I am white, it bothers me that in Philadelphia, 90% of all people who get busted for weed are black.... and I know that black folks aren't smoking 90% of all the weed. I was at a party 3 weeks ago, and while nobody smoked pot at the party, as far as I know, I heard lots of folks talking about wanting to smoke some, or having smoked some.... and all 40 guests were white folks.