Weed, you know, you just get mellow. You can drive pretty stoned and be OK. I mean, sometimes you get too stoned and you can't drive. But you could get pretty stoned and still drive. ↗
I watch people who are not driven by creativity any more, and I think how dull it must be to produce the same kind of thing. If you don't feel you're reaching something new, then don't do it. ↗