i just was thinking, it should be OK if you can get throught the mental withdrawls, and also the physical withdrawls....
but after 15 years you got ALOT of built up junk in there, and from my one experience of quitting (after 1.5 packs per day for 10 years) after about 1 month i started coughing up the most foul things every morning, and then 1/2 the day too.
it's something alot of people don't talk about. the lung cookies that show up when you body finally realizes "whoot we can get rid of the junk now!" LOL
it hurts alot too, straining your stomach muscles coughing so hard and deep.
just wanted to give you a fair "head's up"
good luck
invest in trident gum now LOL it can be a lifesaver