Not using it would be a good start.
Like a charm
No, scientifically charcoal will not "get rid of THC" which is actually very hard to do. Charcoal cannot flush or mask marijuana in a urine test. Most schemes to pass a marijuana test will either dilute the urine or mask it with chemicals so the sample passes a quick stick test. This does not do much good if they send the sample to a lab for further processing.
In order to pass an alcohol urine test, refrain from drinking any alcohol. However, cleaning your body out with a lot of water and cranberry juice can help get rid of any of the alcohol toxins still lingering.
Drink water?
It depends on how long ago you smoked it. Your body gets rid of poisons through your urine. It is excreted in your urine. They test for it by testing your urine to see if it is getting rid of that poison. If it was long enough ago, your body should have finished getting rid of it. Then you should pass the drug test.
Detox tea gets rid of toxins in the body, including the possibility of flushing out marijuana. There is no guarantee how quickly this will happen or if you can pass a drug test afterwards.
for a urine test, 24-72 hours MAX, hair test up to 90 days
Exercise will not rid your body of marijuana. And what you're likely to end up doing is making your urine more concentrated with THC because you'll be dehydrated from the exercise. Quit smoking pot.
No, you cannot add anything to your urine that will allow you to pass a drug test. Once the drug is in your system, you cannot add anything to it to get rid of it.
If you body gets rid of urine, it will function normally.
can not
No it won't.
Marijuana has not been proven to have shown up on a drug test from a second-hand smoke inhaler, unless you count a shot-gun as second hand smoke. Drinking a gallon of water will however, get the marijuana metabolites out of your system faster, and can improve drug testing negativites, because it dilutes the urine to almost all water. Look up detox information if you need more help on the subject, and always use erowid for any drug related issues (google it). It's better to be safe and healthy, then a dead statistic. ~CTL