I used to have the same problem for many years, over 20! I don't smoke tobbaco either.

Do yourself and your lungs a big big favor. Save up your money and buy a halfway decent vaporizer. There is no smoke invovled! You won't have that feeling anymore as your not putting smoke, tar, and whatever else thats in the smoke. You can find them in head shops or on the net. Don't mess with one that involves a flame! Go electric. The buzz is at least twice as good as your not burning up a lot of the THC in smoke - Instead you get it all. I've even used the same herb a second time for another buzz. You might think I'm pulling your leg. Do some research on the net and see what is being said about them - It true and you won't believe it till you try it