Because its medicine for the mind, body and soul.
Medicinally whenever I'm sick, it completely mitigates my symptoms with almost all illnesses.
Because I love thinking. When I smoke alone I usually just sit stoned for a long while wandering with my thoughts.
Because it helps maintain an optimistic view on life. People who doesn't smoke often tend to freak out allot over the silliest shit. I've noticed stoners usually take everything in stride even if it sucks.
Because it makes everything more enjoyable and aesthetic.
Because it makes me notice the small things that are so important yet subtle like flowers or clouds or just the deeper meaning behind simple things like a kid smiling.
Because shit gets funny
Because it makes me enjoy playing music more and makes me more creative.
Because I live in Oregon and here a 1.8 dub costs <No Prices - Chainer>$ and I can easily afford it. Couldn't maintain my daily usage most places.
All that said I also smoke because;
I'm psychologically addicted
Its a useful social tool
Sometimes to avoid shit I don't want to deal with, usually socially, as in getting so high your on your own page and people just sort of leave you there. I like that little isolation sometimes.
To cope with stress
Not so much anymore, but when I was younger and dumber because I got a sort of thrill out of defying the law and society.
This world can be a fucked up place. Wars rage, people starve becuase richer people don't give a fuck, the world is ran by people behind the curtains and we'll likely never know the full agenda, people kill eachother over insane ideologies... What the fuck can I do? I could be an activist I guess, but more relevent to the question, I can enjoy the freedom to be able to get high. I can enjoy what I have. When the world really corners you sometimes it just feels like the best answer is to just smoke another bowl.