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.
When a dog wags its tail in that familiar broad stroked side to side manner, it means the dog is happy and content. When a cat wags its tail it does not mean the same thing at all. A cat wagging its tail is usually a sign of some level of predatory indecision or conflict. A classic example is a cat that is hunting, stalking or tracking something. The cat may be perfectly still, except for its tail which flits from side to side.