Its this boi that likes me so much and he really cares but?

he smokes so much anything weed cigarettes all of dat . his lips getting black too .and i like him and he like me too but i wont go wit him and i neva told him that cause he does all of that all the time. wht should i do and he onlys 16 . he been likeing me since the 8 and im in the 10 now