About 20yrs ago, I broke my leg in 6 places car surfing,,Ill spare you the details,and during my 3 week stay at Babtist hosp in NC, I got my doctor to "prescribe" me as many trips outside via wheelchair that I needed for a smoke. He was a cool doctor for sure, and I had no problem getting a smoking nurse(no pun intended) to wheel me out,as she could get her a smoke also, on company time.I do not recall the doc saying it would help heal my broken bones tho.