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Frequent marijuana use has been reported among TB outbreak patients (9) and was the behavior linking these patients together. Creative sharing of marijuana has been described recently as a factor for M. tuberculosis transmission. In Australia, sharing a water pipe (i.e., "bong") was linked to transmission (10). "Shotgunning" refers to inhaling smoke from illicit drugs then exhaling it directly into another's mouth (11) and was associated with M. tuberculosis transmission among a group of exotic dancers and their contacts (12).

[link to wwwnc.cdc.gov]