That is the point... the 'Lung' has got to be one of the dumbest smoking devices ever conceived. Its not water cooled/filtered ,inhaling burning plastic is VERY bad and hyperventilation is very likely to make you pass out which could cause injury/fire if you are operating it on your own (like the one in hemp 69's description).
Whats the point in us trying to tell the whole world smoking cannabis is safe if people are then going to find health damaging ways to take the stuff just because it seems a
nice idea
Your playing right into the hands of the critics .Anyone who uses a plastic bottle as a smoking device may just as well be smoking soapbar.
Sorry to have to criticize but i do feel very strongly about this.