The fact is, smoking weed causes some damage to the lung, but not the kind of deep lung damage that causes emphysema.

Second, weed doesn't have as many cancer causing chemicals, even before all the additives in cigarettes.

Finally, not a single death has been related to weed alone (i.e. no cigs), cancer or otherwise.

With that in mind, a bong hit only makes the hit go down easier... the harm-reducing is negligible in respect to %THC inhaled.
Goodman3eb Reviewed by Goodman3eb on . How Much Does Bongwater Really Filter Out? How Much Does Bongwater Really Filter Out? In my estimation, smoking weed, in terms of actual smoke damage to the lungs, is as dangerous as smoking an unfiltered cigarette. In your estimation, how much do you think pulling the smoke thru water decreases it's toxicity? Rating: 5