You raise a very good point.
Do you know if the buildings in which meth is brewed are actually less toxic than what was presented in C:DotEoT? One of the talking points was that children reared in home with a meth lab were contaminated with by-products of the brewing process whether or not they were present when the brewing took place. If I understood correctly, the vapors given off whilst brewing fill the building, particularly the ventilation system and porous surfaces (such as wood and drywall). Contamination was said to be so severe that the only remedy was complete demolition of the building and carting it off to the local hazardous waste dump.
What else stuck with me was the interview with the dentist person who makes his living removing diseased teeth from meth addicts. He works for a jail somewhere and said he takes out about 100 teeth a week, year in & year out. And the x-ray of the guy with the enlarged heart. (Although I suppose something other than meth could have caused the enlargement.)
The bit about hospital burn units also stuck fairly well. 39 beds in the unit, and 1/3 filled with folks whose labs blew up. At something like $100,000 per person per week. Oh, and the MRIs of folks who have done meth, showing functional changes in the brain. Which went a long way toward explaining how meth addicts can ignore their children in favor of finding more meth.