I'm also 31 and have been smoking almost as long as I've been coding - since I was 15. An oz per week is pretty heavy smoking - if you can cut that down to at most a 1/4 per week and exercise every day, I think you would see a drastic improvement in your cognitive ability when programming. I've found that intense interval type exercise helps with negative side effects of smoking, especially if you do it in the morning and save the smoking for after work.
Plus, smoking after programming all day helps you shift perspective and think differently about any roadblocks you're stuck on. Best of luck.
Plus, smoking after programming all day helps you shift perspective and think differently about any roadblocks you're stuck on. Best of luck.