a natural bodily function,smoking isn't

Fart is an English word which refers to a bodily process whereby, as a result of the voluntary or involuntary tensing of the anal sphincter, the rapid evacuation of gases from the lower intestine occurs through the anus, which, usually depending upon the relative positioning of each buttock, may or may not result in an audible crackling or trumpeting sound. This process also may or may not result in the emission of odour, which may or may not be deemed foul in character, resulting from the sensation of olfactory components such as skatole, indole, and sulfurous compounds.