Passive Inhalation of Cannabis Smoke

Passive inhalation is sometimes put forward as a reason for a positive drug test result. Research has shown that this is improbable. As an example, in one study volunteers were exposed to smoke from cigarettes containing a known concentration of THC (the active ingredient of cannabis) over six one hour periods. The smoke was so intense that the volunteers had to wear goggles. The highest level detected by GC/MS analysis was only one third of the internationally accepted cut-off level for cannabis.

References:

Determination of urinary cannabinoid metabolites following incidental exposure to marijuana smoke Ferslow et al Substance Abuse 1993

Passive Inhalation of Cannabis Smoke Law et al Journal of Pharmacology 36 1984

Contact Highs and Urinary Cannabinoid Excretion after passive inhalation to cannabis smoke. Cone EJ Johnson RE Clinical Pharmacology and Therapeutics 40 1996

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