Probably depends on the individual. But it's possible! I haven't smoked in 4 yrs 9 months, I'm sevral years without caffeine or alcohol, several years without sugar or gluten and over a year without meat or dairy. I kept going back to PMO again while not picking the other substances back up... I guess I held sexual behaviors in more of an "organic" place meaning they might not be something I need to entirely give up. However, I never had a GF in like 7 years so one reason I am "trading in" PMO is so that I could have a better chance of getting a GF. I wanted to quit smoking when I smoked, and I wanted to quit PMO when I was active in PMO, and I experienced difficulty with both on my own. However, quitting either one has been a lot easier with support. My biggest weakness in life is probably my finances/career. I am really stuck in those areas. So I think improving my financial/career life will be harder for me than quitting smoking or PMO or drinking or anything else. But some people have an easy time with finances/career, using crutches like smoking or drinking or caffeine... For them quitting the caffeine or smoking or drinking would be harder but who knows without self-medicating might not be so functional at their careers.
Smoking. You can take out a cigarette almost anywhere at almost any time (in public or private) and smoke. Cant really do that with masturbation. Avoiding public indecency is time spent willingly refraining from M which is why I find staying outdoors as long as possible one of the best ways to cut on M.