A late change is better than no change brother
if you don't mind me asking, what kind of budget are you working with? I found that writing out my diet organized my shopping considerably and saved me money.
Start a workout plan but make sure it begins slow, 3 days a week, maybe 30 minutes until you feel you've returned to a decent shape, then start building from that.
I can recommend some smoking solutions to stop that nicotine addiction that worked for both my parents, if you're interested.
You can rebuild hair, but you cant undo lung damage
Start drinking a gallon of water a day, you probably know that.
daily protein equaling your body weight
maybe 1/2 to 2/3 your weight in carbs
maybe 2000 calories of whole grain, organic foods a day
Good luck, I'm sure a big part of the community will be behind you on this. :squat: