What is nicotine?

Nicotine is a colorless, oily chemical which is one of the most powerful poisons known. If the amount of nicotine from 3 cigarettes was placed on the tongue or injected into a person, they would be killed stone dead.

Nicotine is the addictive element in smoking, takes only 7 seconds to reach the brain from the lungs (which is twice as fast compared to injecting nicotine into your arm) and is more additive than heroin or cocaine. It has undesirable effects on the heart, blood pressure and digestive system through the increased production of adrenaline. Nicotine is also used as an insecticide.

For more about the source of Nicotine Nicotiana Tabacum