The evidence stating that smoke filtered through water is 'healthier' than smoke from a joint or bong is negligable.
Some government studies I believe have been done on this, but they of course used NIDA supplied marijuana, which is shit.

Government issued and other anti-drug disinformation usually states something like "marijuana contains many of the same chemicals as tobacco smoke but in higher concentrations, marijuana smokes may be at a greater risk for developing lung problems or cancer."
This is all speculation, they leave out that marijuana smokers inhale much less volume of smoke and also that marijuana smoke does not contain polonium 210.
http://www.ukcia.org/research/cancer2.htm

Im not saying no marijuana smokers have ever had or will ever have lung problems. Maybe it just comes down to the individual and is dependent on other lifestyle and location factors. Perhaps you have a treatable lung infection (which cannabis smokers are at a higher risk of getting) and should see a doctor about it.
Nullific Reviewed by Nullific on . false pro-marijuana facts? i love pot. i really do. with every bowl i smoke i love it... but being a daily smoker has caused me some serious lung problems...i dont know who said it isnt bad for your lungs, but yeah...im going to have to cut back to about once a week because of it... be careful, its fucking my lungs up.. Rating: 5