Determining how long marijuana stays in the system depends on a number of variables, unique to every individual and different drug testing techniques. Are you a regular user or is marijuana use something that you engage with just on special occasions? Are you fit or do you carry extra weight? Is the test performed using your urine, saliva, blood, or hair? Whether you are wondering how long THC will stay in your system because you have a drug test coming up, want to educate your patients or clients, or are just curious, read on to learn more. THC (Tetrahydrocannabinol), the chemical in marijuana that drug tests measure, will vary in length of detection depending on the amount that is smoked, how often it is smoked, and the genetic makeup of the person. The only way to really know how long THC will be detectable in your body is to set up your own test. Marijuana is fat soluble meaning it is stored in the fat cells of the body. When smoked, THC enters the bloodstream within minutes....