Do you, or do you have friends who use marijuana often?

As a musician, It seems that a lot of my fellow musicians smoke it, especially when rehearsing or jamming. Some seem to do it as a matter of a daily habit, and others as a more irregular thing. I don’t do it anymore. Even when I did, it was very rare.

I don’t mind (much) that they do, but I often wonder if they think it helps them, musically, or if it’s mainly just a relaxation thing. Maybe they’re more tolerant when they’ve got a bit of a buzz, so mistakes don’t matter, or they don’t hog the space.

If you do this, or have friends who do this, what do you think it’s all about? In what circumstances do you (or they) do it? Is it an all day thing, or a once in a while thing?