We'll need birdgirl to comfirm then, im not sure, and theres a few conflicting sites.

"tetrahydrocannabinol (THC), the main psychoactive chemical found in cannabis, besides its well-known effect on the brain, also latches onto the nerve cells in the upper airways of mammals and short-circuits the signals that cause coughing spasms.

The US government's national institute of health (NIH) has been paying the university of california in oakland to develop a cough cure based on this effect. Researchers found that a recently discovered relative of THC â?? arachidonylethanolamide (anandamide) â?? can have a similar cough-quelling effect, but without also making users high."