I was a part-time closet smoker for about 15 years. I tried to quit way back at the beginning of that span but couldn't kick it. Two years ago, Thanksgiving, I quit for good. As a long-time smoker, I'll tell you that it is easier than you think. Just get past the 20-day mark and becomes remarkably easy. At that point, the urges go quickly and, in my case, I would actually feel sick even thinking about it. There are still little triggers, but they pass in seconds.
As far as the lungs... and the voice. I can attest to what you're going through. The coughing will fix itself; the voice may be different forever. I've always had a good singing voice. I still do, but my range has narrowed terribly. I've been singing out loud a lot more and just cannot wrap my mind around how much it changed for the worst after quitting. I'll probably go to my grave wondering why, but hopefully I'll get there about 15-20 years later.
Anyway, I'm not sure there is an easy answer on how to quicken the "repair". Proper hydration, as a practice, will help. Cardio will help. If you're changing all these habits, work a nice 20 minute walk into the fray every day - that could very well work wonders. Brisk walk, exercise the lungs.
Don't know what all you're trying to change. Sounds like you're maybe giving yourself a wakeup call, health wise? At any rate, not sure why you're trying to quit coffee. That's just sacrilegious for a Canuck.
Congrats on taking the first step(s)! I wish you the best of luck. Pretty sure we're the same exact age, I promise you a new lease on life
psychologically, above and beyond the physical rewards. So many at my 40th reunion talking about "the damage is done" as an excuse to keep smoking. It's not done, the mind and body have a remarkable way of healing themselves. At our age we start to look at that monkey on our backs and think he's there forever. Throw 'em on the ground bro, throw 'em on the ground. You can do this!