Weed (THC) can be detectable for a few days up to more than a month after smoking, depending mainly on how often you use, your body fat, and the type of drug test.

Quick Scoop

  • For a one‑time smoke , urine tests usually detect THC for up to about 3 days.
  • For moderate use (a few times per week), detection can stretch to 5–14 days.
  • For daily or heavy use , THC may show up in urine for 30 days or longer , and in extreme cases up to 6–8 weeks.
  • Blood tests usually only catch THC for up to 12–24 hours , because levels drop fast after the high wears off.
  • Saliva tests often detect recent smoking for about 24 hours , sometimes a bit longer in heavy users.
  • Hair tests can show cannabis use for up to 90 days , since metabolites get locked into growing hair.

THC leaves the high in a few hours, but its metabolites hang around in fat tissue and leak out slowly, which is why tests can stay positive long after you feel sober.

What Changes Your Timeline?

Key factors that change how long it takes weed to leave your system after smoking:

  • How often you smoke
    • Occasional: usually clear (for most tests) within 3–10 days.
* Regular/daily: **weeks** , often **30+ days**.
  • Body and metabolism
    • Higher body fat can store more THC metabolites, so it may take longer to clear.
* Faster metabolism and regular exercise may help your body process and excrete metabolites a bit quicker, but there is **no safe way to “instantly” detox**.
  • Test type and sensitivity
    • Stricter/lower cut‑off tests can spot smaller amounts of THC, stretching the detection window.

Rough Detection Windows (Urine)

These are typical ranges people and clinics report (not guarantees):

  • One‑time use: up to 3 days
  • 1–2 times per week: 3–7 days
  • 3–4 times per week: up to 10–14 days
  • Daily/heavy use: 30 days or more , sometimes 6+ weeks

If You’re Worried About a Test

  • Give yourself as much time weed‑free as possible ; more days clean almost always helps.
  • Stay hydrated, eat a balanced diet, and exercise moderately, but avoid extreme “detox hacks” that promise overnight cleansing.
  • At‑home urine tests can give a rough idea of whether you’re still positive before an official test.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.