Nicotine.
Nicotine is the chemical that causes addiction.
Nicotine
An ingredient called nicotine is what is so addicting. Nicotine travels from the lungs, into the bloodstream, and directly to the brain from there, and nicotine causes the brain to demand more of the nicotine, causing the addiction in cigarettes.
Nicotine.
It certainly dose, a chemical in cigarettes and other tobacco products, called nicotine destroys brain cells it also causes addiction which makes it almost impossible to quit. So never start smoking and you will not endure all those problems. FUN FACT: tobacco is also filled with sidewalk tar
what chemical weathering called oxidation causes
Nicotine, a toxic substance is the chief active chemical of tobacco that makes it addictive. Tar, a dirty chemical which darkens the lungs And some chemical called Para-Methoxybenzaldehyde, which i don't know what it can do.
cigarettes
The chemical in marijuana that causes a high is called tetrahydrocannabinol (THC).
Cigarettes are very addictive because once you've started it's hard to stop. Nicotine, the main chemical in cigarettes causes you to get tempted to smoke it because of the high level of amounts in a cigarette
An addiction to cigarettes starts by smoking them. Cigarettes contain a chemical called nicotine. The nicotine triggers receptors in the brain and causes feelings of relaxation or pleasure. So after a while, when someone starts to feel stress, they have conditioned themselves to reach for a cigarette. There is both the physical addiction of the nicotine, and also the psychological factors. The psychological part include the habit of putting things in one's mouth, as well as factors such as stress, loneliness, boredom and nervousness leading the person to want a cigarette.
I believe Tar is what gives it the blackish color but there are MANY chemicals that cause cancer in cigarettes.