I've owned many parrots, from quakers to eclectus (including a grey), and can tell you with certainty that getting them high isn't inherently bad (not to say that it's good either, or that no bird could have an averse reaction, but it is certainly not generally toxic to birds or any other animal for that matter).
Eating is quite different. In fact, uncooked bud will make animals (humans included) sick, and in excess could kill them. Bud contains rigid silicate structures that will act like spears in your digestive track, it can cut up your insides kinda like glass. Cooking the bud breaks down those silicate structures and makes it safe to eat.
Almost everything about birds is more delicate than other animals, but at the same time, they aren't like fine china. For instance, many a bird has lived (relatively) long lives in homes with cigarette smokers. Not to say it was good for them, but other than the rare freak occurance (remember the kid in the 80's that died from doing coke once?) you're not going to see your bird croaking from your second hand vapor
Good to ask though, as pointed out, things you might not think are problematic, are. Like the oxidization from teflon, or avacado...