I would say the same for myself. It doesn't interfere with my work performance, and I tell myself it's better than if I were drinking or whatever, but it has definitely become a compulsion and I basically can't regulate my usage if I have it available in the house. Lately I've gotten a little timed lock box to force myself to take breaks which I'm kind of ashamed to have to resort to, but it's helping me keep a better balance.

I will also say - and maybe this is more self-justification - but while I definitely cannot really do focused productive software work while stoned, I really do think that it puts me in a more creative mind-space and helps me see alternatives I wouldn't otherwise. I often go for a long hike after work and get stoned and stumble upon an approach to a work or life problem that's bouncing around in my head that I would not have otherwise.