Wow 3-4 a week.... I dont even own it i always do it in the school bathroom with a bud and we go through about 1 can a week. We use grizzly, and it seems like if i take a massive wad then it will burn my lip a bit but then it heals over night and is just stronger and it takes more to make it burn. If my lip did start to get messed up id def. stop cuz i aint addicted or anything.