I have never smoked anything except bud (a few cigs when i was young, and a cigar or two now and then) generally in day to day health, i am extremely healthy, i run ALOT and workout very regularly... but if i smoke alot for several days straight, i can actually give myself a mild pnemonia that is caused by too much drainage. I smoke only blunts too so this is a reason for that, blunts are a little harder on your lungs because of the thicker tobacco (but if you have ever tried to smoke some sticky icky icky out of rolling papers you know why i like blunts) bongs are obviously the cheapest and safest smoking method, vaporizing being the best (and shittiest tasting)

(i almost died of pnemonia after my Y2k party, i smoked over 1 1/2 oz to myself)