I can tell you've been smoking for a long time now because I was at the same crossroads a few years back.
At one point I seriously felt the law of diminishing returns after every time I smoked. I would look at my bong and just imagine how my lungs must have looked like.
I work in emergency medicine and I see patients coming in all the time with complications with COPD, (chronic obstructive pulmonary disease). As much as I believe smoking gets you high, I feel the same in that smoking will increase your chances of developing one of the few terminal pulmonary conditions.
I dont want to be in my 70 or 80's slowly drowning in my own lung fluids, because thats what happens. It's the slowest most agonizing way to go in my opinion.
So I put down the pipe in the name of my health and picked up a vaporizer. It was one of the best investments I've made with marijuana. Not only does it seem get the most out of your weed; it is a lot cleaner than smoke.
www.gotvape.com they have some great deals on vaporizers. Cant go wrong with a volcano...
Though I still enjoy an occasional blunt with the homies.
Peace