Just read somewhere (not quoting directly, but close enough) about a guy who went to R’ Yisroel Salanter saying that he’s addicted to smoking and couldn’t control himself from smoking on shabbos.
R’ Yisroel asked him, “How many cigarettes do you smoke a day?”
“36,” he answered
R’ Yisroel said – even if you cut down to only 35 cigarettes a day, that will be your tremendous schar in holding back from violating hilchos shabbos.
Eventually he cut down by 1 cigarette every few weeks and was able to completely refrain from smoking on shabbos.
Little steps.