_______ is/are responsible for cigarette smoking's addictive nature.​

A) ​Tars
B) ​Nicotine
C) ​Aldehydes
D) ​Carcinogens

Nicotine is a highly addictive substance found in cigarettes that causes the release of dopamine in the brain, leading to feelings of pleasure and reward. This neurotransmitter reinforces the behavior of smoking, causing addiction. Tars, aldehydes, and carcinogens are harmful chemicals found in cigarettes that contribute to various health problems associated with smoking but are not directly responsible for the addictive nature of smoking.