THC, the psychoactive component of marijuana, can stay in your system for varying lengths of time depending on the type of drug test, frequency of use, metabolism, body fat, and other factors. Detection times by test type:

• Urine: THC metabolites can be detected from about 1 day up to 30 days or longer. For occasional users, detection is typically 1-3 days; moderate users (3-4 times per week) about 5-7 days; daily users 10-15 days; and heavy users 30+ days or more

• Blood: THC is detectable for up to 12-48 hours after use in most cases, but chronic heavy use may extend detection to up to 7 days

• Saliva: Detection usually lasts up to 24 hours, sometimes up to 30 hours, with heavy or chronic users possibly testing positive slightly longer (up to 72 hours)

• Hair: THC can be detected in hair follicles for up to 90 days or longer, as hair testing reflects longer-term use. However, hair tests are less commonly used and sometimes prone to false positives due to environmental exposure

• Sweat: THC may be detectable in sweat for 7-14 days, though this test is less common

Additional notes:

• THC is fat-soluble and accumulates in fat cells, so people with higher body fat percentages may retain THC longer

• Metabolism speed, hydration, frequency and amount of cannabis use, potency, and method of consumption (smoking vs. edibles) all affect how long THC stays detectable

• Edibles tend to stay in the system longer than smoked cannabis, with detection windows ranging from 3 to 12 days or more depending on use patterns

In summary, THC can be detected in the body from a few hours up to 90 days depending on the test type and individual factors, with urine testing being the most common and variable based on use frequency.