Why does nicotine make it difficult for a smoker to quit using cigarettes?

It helps with weight loss for many people.
It makes people sleep long hours.
Many people experience intense headaches.
The cost of nicotine is very affordable for teens.

Nicotine is a highly addictive substance that affects the brain's reward system, leading to a physical and psychological dependence on cigarettes. When a smoker tries to quit, they may experience withdrawal symptoms such as irritability, anxiety, intense cravings, difficulty concentrating, and mood swings. These withdrawal symptoms can make it challenging for a smoker to quit using cigarettes. Additionally, the routine and habit of smoking can also be difficult to break, especially if it has been a long-standing behavior.