I took up smoking late in life.... when I was in Army Basic training serving my obligation (at the time). I quit smoking shortly after I retired and noticed had noticed health issues with my breathing. I then developed a foot problem (gout) with a bit of weight gain. I returned to cycling to get exercise... or at least get outside. I've never really enjoyed exercise. But was thrilled to find I still loved cycling as much as when I was eight.
The first couple of years of cycling I was convinced my breathing would never return to normal. Thank God... I was mistaken. I ride everyday I can... just because that is what I want to do... and I still can.