My (20f) bf (20M) smokes a lot and it concerns me

so my bf and i have been in a relationship since 11 months and we rly love eachother. The thing is before meeting me he used to smoke 10 cigarettes a day and now it’s down to like 7 a day and i have told him that i don’t have a problem with occasional smoking but smoking 7 everyday or more is NOT normal… he says he will stop but doesn’t try… idk what to do everything is normal in our relationship, his father (passed away in 2020) used to eat tobacco in secret sometimes… it breaks my heart to see my potential future life partner ruin his health and lungs like that. i don’t wanna break up obvious but how do i get him to quit smoking?( I don’t want to breakup cuz we are so perfect together )