How long does cannabis stay in your system?

No single number. Detection time depends on the test, how often you use, dose, route, and body fat. THC is the main psychoactive compound in cannabis. The body stores THC and its metabolites in fat. That storage slows removal.

how long does weed stay in your urine

Common detection windows:

how long does marijuana stay in your blood

  • Urine: 1 to 3 days after one use. 1 to 3 weeks after regular use. Up to 30 days or more for heavy long-term use.
  • Blood: 1 to 2 days after one use. Up to 7 days for heavy use. THC peaks in blood within minutes to hours.
  • Oral fluid (saliva): 1 to 3 days. Some tests detect THC for up to 72 hours.
  • Hair: up to 90 days. Hair tests show past use, not recent impairment.

Factors that change the window

Frequency matters most. A single low-dose use clears faster than daily high-dose use. High body fat can extend urine detection. THC is lipophilic. It binds to fat tissue. Metabolism, liver function, age, and hydration also play roles. Route matters. Inhaled THC peaks fast and leaves blood fast. Edibles produce slower peaks and longer blood presence. Product potency matters. Concentrates can raise THC load.

how long does thc stay in your body

CBD and drug tests

CBD isolate contains no THC. Full-spectrum CBD may contain THC. The federal legal limit for hemp is 0.3% THC by dry weight. Repeated high doses of full-spectrum CBD can build THC metabolites. That can trigger a positive urine screen. Labels are not always accurate. Third-party lab tests show THC content. Check a certificate of analysis before you buy.

How Long Does Marijuana Stay in Your Blood?

Test cutoffs and confirmation

Urine immunoassays often use a 50 ng/mL cutoff. A positive screen goes to GC-MS or LC-MS/MS for confirmation. Those methods use a lower cutoff, often 15 ng/mL. Blood tests are less common for routine screening. They detect active THC and metabolites. Oral fluid tests detect recent use. Hair tests have a long window but cannot prove impairment.

What this means

Detection windows are estimates. Individual results vary. No home method flushes THC fast. Hydration, exercise, and diet do not guarantee a negative test. If you face a drug test, consult a medical professional or legal advisor. This article is information, not medical advice.