amount of marijuana used
For a first time pot user, thc will remain detectable in the body for a period up to 7 days. For a casual marijuana user (2-3 times a week); thc can be detectable for a period up to 21 days. Chronic users who smoke pot everyday can expect to excrete thc toxins for up to 90 days. This is an extremely long time for such a relatively harmless drug to be detectable in a drug test.
quality of marijuana used
Currently t he marijuana found in the United States has a THC concentration of around 8.5%- 9%. In the early 1990s the thc concentration was around 3.5%. It is estimated that marijuana sold in coffee shops in Amsterdam has a THC concentration of around 19 percent. Since marijuana comes in so many different strength; it is relatively impossible to know exactly what level of THC concentration a person is ingesting when using marijuana. If a casual user were to smoke an incredibly potent strain of marijuana, it would have the same effect on THC content in a person’s fat, as if a chronic or daily user were to smoke a less potent strain of marijuana, and thus take longer to excrete out of the system.
metabolic rate
A metabolic rate is the rate at which a person's body run. A person with a faster metabolic rate will have a shorter detectable time for weed than a person with a slower rate. That being said, a person who smoked pot recently and has a fast metabolic rate will excrete larger amounts of thc than a person with a slower metabolic rate. This is important if you are using a temporary detox product to pass a drug test. The metabolic rate ties in with the next factor in determining how long marijuana stays in your system:
body fat percentage
Body fate percentage is critical to determine how long thc will stay in your system. A person has to be honest with the amount of body fat they have because THC is stored in the fat cells in your body. So the more fat cells that you have the more storage space you have for marijuana.