Quote Originally Posted by P.E.N.G.U.I.N.
If you don't exhale any smoke, it could mean your lungs absorbed it all/all the carbon in the smoke stuck to the inside of your lungs (FUCKING NOT GOOD!)

The only reason smoke is visible is because of tiny carbon particles so small they float like all those little white things you can sometimes see floating in any room. If your waterfall was full of smoke that all went in to your lungs and no visible smoke came out, you just gave your lungs a nice layer of carbon :thumbsup:
Takes years upon years of accumulation to cause irreparable damage -- the 'scars' are still there, but they heal if you take it the hell easy.

If this behavior of 'holding it in' persisted, however, the least you can hope for is lung cancer aside from the many respiratory issues you'll be bumping into on your short lived journey to the grave.

The least.

Although, my father's been smoking marijuana since he was about fifteen, and he's now almost sixty without much visible damage to his health -- he doesn't wheeze; doesn't cough unless he took a fucking huge hit. Then again, he's been smoking out of bongs exclusively for the past fifteen or twenty years, and he isn't a heavy smoker to begin with.

He also doesn't hold the hits in for more than three seconds.