If you smoked marijuana for one day how many days would it take to be clean?

It depends on your height and body weight. Unlike most other drugs, THC is fat-soluble: it stores itself in your fat cells. That's why drinking water won't do anything to remove it from your system, and that's why it takes such a long time to get it out of your system. Drugs like opiates or cocaine or speed stay in your bloodstream, so you can pee them out in a few days, but since THC stores itself in your fat cells, you basically have to work it off, like, exercise it off, which takes weeks, depending on your height and body weight. If you're short and skinny and you exercise a lot, you might have to stop smoking for only 2 weeks or so, but if you're large and you don't exercise, you'll have to wait a month, or even six weeks.

If you want to cleanse your system more quickly, there are also detoxifying drinks you can take. I took one once (with success); it was called "Herbal Clean." You can buy them at GNC or other health stores like that. Except, they're just called detoxifying drinks or something. But if you ask the salespeople, they will usually know what you're talking about, and will find it for you. Don't just buy anything that says Detox on it, because they have a lot of different kinds of detox drinks. Ask the salespeople.

Note that buying these drinks for the purpose of fooling a drug test is illegal. However, buying the drinks for any other reason is not illegal. So, do not say to the salespeople, "I need a drink to pass a drug test." Tell them, "I want a drink that will detoxify my system of drugs so I can get healthy," or something. As long as you do not tell anybody that you want to pass a drug test, it is perfectly legal.