Depends how often you smoke. How much you weigh... Well not entirely on how much you weigh but how much fat you have on you.. It will take a 1-2 months 2 months to be safe if you just smoked today.. 2 months if you have a lot of fat on you and about a month if you don't.. Some people who have a very low fat percentage on their body can even pass a drug test right away ive heard..
