Abstract of main article: A week after smoking cannabis only 60-70% of the THC has left the body because it is stored in the body fat. It takes about 4-6 weeks before THC is undetectable in the blood. On the other hand, the psychoactive marijuana effects are gone after a couple of hours.

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Sources list for:
"Effects of Marijuana on the Body ; Marijuana Effects"

  1. American Psychiatric Association, Washington, DC (1994). Diagnostic and Statistical Manual of Mental Disorders: DSM-IV, 4th ed. s.215-221 Cannabis-related disorders.
  2. The clinical experience of Wendy Moelker, Psychologist in charge, tutor, Emergis center for mental health care, Goes, the Netherlands.
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