There are many reasons why a person may smoke:

Addiction:

For cigarettes and other types of tobacco, nicotine is the primary addictive drug that attacks parts of your body, such as your brain. Through time, your body adjusts to having nicotine within it. Around 80% to 90% of people who routinely smoke are nicotine addicts.

Process of Addiction:

Nicotine enters your brain in only takes 10 seconds of entering your body. When it reaches the brain, the brain release adrenaline, which allows the body to experience a small amount of pleasure energy. But because the amount of pleasure and energy fades quickly, you would crave it so you may end up taking another pull from your cigarette or