Yes.
Nicotine is found in tobacco, as well as in certain herbicide and insecticides.
The primary toxin in tobacco is nicotine, an alkaloid which is addictive as well as a toxin. Chemical formula is C10H14N2. Additionally, smoking tobacco also produces carbon monoxide (CO), a gas that...
Carbon Monoxide
The Nicotine itself is an addictive drug itself / some claim that nicotine is more addictive than heroine/I forgot to sign to respond to this one.