Urine detects single use ~3 days, regular use 5-7 days, daily heavy use 30+ days; blood 1-2 days, saliva 1-3, hair up to 90. THC stores in fat, so time is the only reliable flush.
What to do
Common questions
How long does THC stay in your system?
THC is fat-soluble, which makes it the long-stayer among common drugs: it stores in body fat and releases slowly, so detection windows stretch with use. NIDA's drug testing guidance and standard toxicology give the typical windows: urine - the usual workplace test - about 3 days for a single use, 5 to 7 days for regular use a few times a week, and 30 days or more for daily heavy use, with some long-term users testing positive past a month. Blood catches 1 to 2 days, sometimes longer in heavy users. Saliva 1 to 3 days. Hair up to 90 days. Individual factors shift these: body fat percentage, metabolism, dose, and product potency - today's concentrates deliver far more THC than flower. Dilution tricks and detox drinks are unreliable and labs check for them; nothing credible speeds fat-stored THC out except time. Two extra stakes worth knowing: driving - THC impairs reaction time for hours after use, and some states treat any blood level as impaired. And employment - a positive test weeks after quitting is real for daily users, so plan quit dates around test dates accordingly. Pymander is a free AI doctor, 24/7 by text. Describe your use pattern and the test timing, and it can help you estimate your window.