For me, I turned into a gym rat. I've always been physically active, hell I'm the military so we kinda have to. Since I've quit, I focused all my energy to the gym. Right after work, I run two miles, hit the weights, then hit the heavy bag until I'm dead. This allows me to release all that damn rage that builds up over the course of a day that would have had me scrambling for a can a couple of months ago. Since I've quit, I've noticed a few things. My workouts are longer, I'm way stronger, and have much more stamina. Nicotine was a major part of our lives for a long time. Now that it's gone, there's a hole there. Fill that hole with something constructive. For me, it's my workouts. For you, it may be a hobby. Point is, replace it with something. It's worked wonders for me. I'm not the same person I was two months ago. I'm better, stronger, faster, and more importantly QUIT!