The main risk of smoking is you can get heart cancer, lung cancer, and it is the leading cause of death.
The main chemical in all products is nicotine, carbon monoxide they are all really bad and they can hurt in many different forms.
Nicotine is an extremely powerful and addictive drug. When nicotine enters the body it interacts with receptors in the brain. The brain sends messages to the body to speed up heart and breathing rates. As these feelings fade they leave the user wanting more.