imo, the first pic, that little white patch looks like PM to me but it's not zoomed in enough for me to say for sure. the other pics it looks like crystal. it's kind of hard to say.
a good test is take a nug between your thumb and middle finger. start flicking it with your pointer finger onto clean surface. crystals do not come off so easy. when it does it's heavier and yellowish in color, see pics of kief. PM will fall off very dusty like and not be as heavy. it's also white. if you have a good enough magnifier you can just look right on the bud itself. research pics on google image and such for what to look for.
i personally dont like treating with h2o2. it kind of ruins the buds. i mean they're ok, but not as good once treated. as a matter of fact i dont like ever spraying my plants or treating with anything at all. i only spray the surface of the soil. i keep PM away by keeping low humidity and high temps.
by medical stardards no the stuff is no good at all, if that stuff in fact is actually PM. according to medical laws, at least in mi, the product has to be mold free.
personally though, i've seen a lot of powdery mildew stuff. i've even had an issue with it myself about a year ago. that smoke actually looks real good but those white patches scare me. i've smoked shit just like it before and you should be fine. it's not good for you but neither is smoking anyway. i probably wouldnt use it for cooking. vaping may even be a bad idea since the low temps may not be enough to destroy the shit. i guess smoking your going to inhale the spores anyway from sucking the air in before it gets the flame or hot air.
truth about mildew spores, they are everywhere! we are all breathing them in right now. unless your a bubble boy or in a completely sealed room with a proper air filtration setup and in a sterile environment. most people dont have that though. for growers they need to keep the humidity down. one huge overrated factor is keep temps up. there are many different mildew strains and some dont need much humidity. the little condensation caused by going from low temps to high temps is plenty of moisture for some strains of PM to reproduce. you can treat with neem, azamax, or use a sulfur burner, but growers are better off just taking steps to prevent it from forming in the first place.