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.
This page goes through common body language behaviors that cats display, and tells you what they usually mean. For sake of ease, I've split it down into different body parts so you can find what you're looking for more easily. 1) Cat body language: Tail. 1  Swishing. 2  A swishing tail (i.e. the whole tail slowly and gently moving from side to side) usually means Kitty is alert, curious and interested in his environment. 3  Lashing.