neem is not healthy to smoke... how much wil remain in a few weeks? a phd in chemistry wouldn't be able to give you a solid answer worth depending on.. they'd give a good guess, sure, or if it was more than certain they could provid ethat info too. i doubt it's in that ballpark though.
I'd look into alternatives.
DE - diatomaceous earth... spread it around grow area .. get foodgrade for indoors, even if it says "not a pesticide" it only has to do with regulartions a lack of directions but functions the same... any insects that walk across it are not well aftwerward. i just ordered some. i plant to run it around the box and inside a bit. outside, teh wind can blow it away, but other ways to use too.
that's more preventative and for future grows.. may not help now.
try to avoid treating soil or foliar spray if possible -- especially in bloom period. upto you if you want to try.. maybe, to save a crop i could rationalize it, but i'm not a smart person, lol. if i thoughtit'd be a little damage and nothing more, i'd ignore it and avoid the neem.