*** Probably added to cigarettes because of its sweet odor. ***

"Keep out of reach of children.
This oil is very irritating to skin!" -- from a company that sells the product as an essential oil (theeyeofthenewt.com)

"It was found that 6 drachms of the oil would kill a moderately sized dog in five hours, and 2 drachms in forty hours, inflammation of the gastro-intestinal mucous membrane being observed." -- Botanical.com

"Cassia oil should not be used on the skin as it is a dermal irritant, dermal sensitizer and is a mucus membrane irritant and must be avoided in pregnancy." -- another company that sells cassia (essentialoils.com)