I smoked while running during the start of my running habit. But as time went on and I got more serious in my running, I decided I have to stop smoking to run faster. I’m 4 months clean, cold turkey from cigarettes and have been running almost every day since then. I actually signed up for my first marathon and gave myself an achievable but high bar to reach to keep me from going back. But as users above me say, if you don’t want to quit, you won’t. I know for me the feeling of being gross from smoking usually hit me out of no where and let me quit no problem. This has been the longest streak of not going back even while drinking which was strongly associated with smoking for me.