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if you smoke often enough it's barely impairing.
road cycling is great, can really get in the zone and threshold for suffering goes up.
same for gravel grinding
xc is amazing, especially if there's nice scenery
last time i did gondola DH i smoke and sent my rental bike off a cliff, for that, the minor reaction time impairment was not worth it, although i kind of suck at riding dh
skiing high is amazing, but i won't do black diamond runs if i'm high though. sitting on top of a mountain with a jet lighter is really nice.
Basically i think if you smoke enough, and are within your comfort zone, it makes any sport better.
I will say though, that smoking regularly seriously impacts your cardio capabilities, and when i've stopped blazing for long periods, I get a lot fitter because of it. You're seriously handicapping yourself if you smoke weed often and cycle. It is great though.