Why is there butane in cigarettes?

Butane is a highly inflammable gas! It's used in gas cigarette lighters, which probably explains why minute amounts MAY be detected in tobacco smoke.

Butane is also used in camping stoves and is present in natural gas. So when you light the gas, be quick. Any amount of unburnt butane that escapes, however small, could be "lethal", according to Tobacco Control Propaganda!