Marijuana, the most often used illegal drug in this country, is a product of the hemp plant, Cannabis sativa. The main active chemical in marijuana, also present in other forms of cannabis, is THC (delta-9-tetrahydrocannabinol). Of the roughly 400 chemicals found in the cannabis plant, THC affects the brain the most.
Cats 'vibrate' when marking territory-spayed cats can also 'dry' spray. Spayed male cats urine doesn't smell. They swish their tales as a sign of annoyance or anger. If the tip of the tail 'trembles', it's quite often a sign of being 'unsure' about something. Source(s): Cat owner.
Cat Spraying Urine How To Stop. What is Cat Spraying. Feline Spraying (also called marking) is a cat depositing a small amount of urine on vertical surfaces, such as furniture, doorways and walls. The spraying cat may be seen to back into the area, the tail may quiver, and with little or no crouching the cat sprays the urine.