For me it’s driving while under the influence. If you couldn’t tell, I like me some ganja. However I have long since held the belief that it is utterly insane to drive while under the influence of most substances, with maybe nicotine and caffeine being the exception. All too often I see other stoners smoking and driving, which I simply can’t fathom. I’ve only operated a vehicle once under the influence and it was just to move a U-Haul around the block to a different parking spot, which was such a scary experience while high that I refuse to even consider getting behind the wheel again while high.
I paint and draw, purely as a hobby. You wouldn’t believe the amount of crap some people have. Brushes they use only once in a lifetime, for one specific element. Special colours they also get to use only once. Pencils they don’t even open. Get a basic set, familiarise yourself with it, stretch it to the full extent of its capabilities (that’s mastery), and then upgrade to a higher quality version of what you have. No single-use novelty tools and materials.