Good luck Rival, I quit 2 years ago and haven't looked back.
Try focusing on the obvious plus's you will start noticing in the coming months. The cash and the health benefits are the two main ones. No more coughing your lungs out, and being able to go for a run without nearly dying in the process
It's a very tough road, but it really does get easier the further you get into it. I know how hellish it is quitting, so I hope hearing from others that it really does ease off gives you some incentive.
Be EXTREMELY careful around alchohol and friends, the toughest test for me was going for my first night out after quitting.