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.
A cat's tail isn't just for decoration -- in fact, it's actually very practical. Cats use their tails for balance, but also for communication, meaning that tail movement is as voluntary as waving your arms. While the way you cat uses his tail varies, it's always thanks to his anatomy. Your cat's tail may look simple, but inside, there's a lot going on.