Toxins of a certain bacteria (Staphylococcus aureus) cause vomiting, which can be combatted by activation of the CB1 receptor, Japanese researchers demonstrated in animal studies. Toxins of this bacteria are the major cause of food poisoning in humans throughout the world. Both antagonism at the 5-HT3 serotonin receptor and activation of the CB1 receptor by cannabinoids were effective in reducing the symptoms. (Source: Hu DL, et al. Cell Microbiol 2007 May 21; [Electronic publication ahead of print])