That's a strange question to ask yourself, because I don't really think about why I do it. I guess I do it because it makes life better and more fun. It also helps me relax and think about things rationally, and it puts me in a better mood. In general, everything is better while you're high imo.
Sometimes I'll smoke to be more social, sometimes I'll do it to relieve stress, sometimes I'll do it just because I'm bored/feel like it. It really depends on the situation, but I'll still probably do whenever I can anyways.
And it also helps me think more rationally and helps me see better solutions and other possible ways to get things done that I probably would have never thought about when I'm sober.
Well i do it because everything seems funnier when your with freinds. I tend to think alot while on it too.
I also been using it lately mainly for weight loss, (back then i gained weight because of munchies), but now since im used to it, it actually helped me lose weight, lose around 5kilo so far.