I’m not proud of the fact that I know this (I had a troubled youth), but unless someone is directly blowing it right into your face, second-hand meth smoke is not really a thing. It looks like a vape cloud and dissipates extremely quickly, and honestly unless some tweaker left a lightbulb with burn marks on it around you probably wouldn’t know anybody smoked meth in the vicinity from the smell. I think we have a case of histrionic librarians here.