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05-01-2006, 12:16 PM #3Senior Member
System Run Down By Weed?
Don't know if this helps, but...
Tetrahydrocannabinol (THC) is the major active component of cannabis, or marijuana. Receptors to THC have been found on B cells, natural killer cells, neutrophils, monocytes, lymphocytes and macrophages (Life Sci 1999; 65:637-644). Marijuana has measurable in vitro effects on the immune system, particularly in reducing cell-mediated immunity, which might increase susceptibility to infection. Clinical studies in humans so far, though, haven't demonstrated that these effects are clinically relevant (J Allergy Clin Immunol 1976;58:483-490). Chronic smoking of marijuana, however, can raise one's susceptibility to respiratory infection and cancer (Cancer Epidemiol Biomarkers Prev. 1999;8:1071-1078). If the marijuana is contaminated with mould spores, which is common, smoking it may lead to allergic asthma, infection or hypersensitivity pneumonitis (J Allergy Clin Immunol 1983;71:389-393)
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