Hopefully, you are asking what's the fastest way to get THC out of your system because you are curious, and not because you need to hide the fact that you have smoked or eaten marijuana prior to a drug test.

THC stands for tetrahydrocannabinol, which is the psychoactive ingredient found in marijuana. Consider trying one of these methods to get THC out of your system.
One way that you can attempt to get THC out of your system quickly is to head to the store and buy several liters of Ocean Spray Cranberry Juice. You want to have the equivalent of around 100 ounces. You should also get a big case of purified water while you are there as well. Drink a glass of cranberry juice every hour if your drug test is the next day. If you have a few days, then drink one glass every hour for the first few hours and then slow it down a little bit. The reason that you have the water is if you get tired of the cranberry juice, you can mix it up with water. However, the cranberry juice should be the primary focus.
Please be careful though. If you drink too much liquid in a short amount of time, you can run into some serious health issues-including death.
This mixture is advertised as cleansing your system entirely. Of course, people often purchase it with the purpose of getting rid of THC or other drugs in their systems. However, this cocktail does not necessarily remain effective for very long. In fact, there have been some reports that it will only cleanse your system for between six and eight hours. After that, you are on your own!
How well a substance like this is going to work is going to depend a lot upon your body and how frequently you have ingested THC.
If you think that you can stomach drinking some apple cider vinegar, then this might be a remedy for you as well. The key to apple cider vinegar is that it gets rid of fat cells in your body. THC is frequently stored in fat cells, which is why heavier people have more trouble getting rid of THC than some other individuals do. Try mixing up the apple cider vinegar with water in order to flush the THC from your body.
Well yes, these drinks are the fastest way to get THC out of your system and are especially designed for people who need to get THC out of their systems quickly after smoking marijuana. However, the trick here is finding someplace where you can actually purchase this type of solution.
Once you have it though, you will need to take it only a few hours before you go in for your drug test.
When you smoke or ingest marijuana, you get THC in your system. In addition to being clean of drug substances, you could need to get marijuana out of your system because of a job interview. Some jobs do drug testing, both when they interview you and periodically during your employment with the company.
Another option is to just get off of the drug altogether. As with any substance, you can try to quit cold turkey. Keep yourself away from situations and people that might inspire you to smoke marijuana. If you do not feel that you can accomplish this task by yourself, seek out help from a local drug counseling center or ask your doctor for a referral.