I've smoked since I was twelve. 1958 it was. Started the pipe in '67. Always chewed when working around the barn and later, on the flight-line. I quit cigarettes one time for five years, not sure why. When I returned to cigarettes I switched to luxury cigarettes as the wrapper wasn't infused. What I'm getting at is, why quit something you like.
My first suggestion would be to get back into shape. It's a lot easier to make serious life style changes when your body is up for the change. Nicotine deprivation is a serious change. Give thought to dropping tobacco totally if health is a concern. If that isn't an option you wish to consider, use the pipe sparingly until you've attained a reasonable lung capacity, body tone and stamina. Then, begin to delve deeper into the world of pipe smoking, always maintaining a reasonable state of condition.
It took years to get into the condition you are currently in. Should only take a few months to get into a reasonably fit state. Then you should reward yourself with a wee vice, smoking if that is your choice. I always enjoy kicking back and watching my hard earned moneys waft gently towards the sky.
I smoke for the nicotine and a bit of pleasure, pipe, cigarette and cigars. Chewing days are pretty much over unless I'm in close contact with an animal subject and the odor might drive it further away.