You fools inhaling hot gases through plastics deserve all the lung damage you can breathe in. This particular organ is your primary life support and some plastics tend to release their more toxic components under heat...
Besides, it's much more elegant and fun to use
glass,
pyrex,
stainless steel,
aluminium, select
rubbers,
beeswax at a pinch,
o-rings,
magnets... clean
water... see your
Certified Bong Technician.