Okay kiddo, I'll try to explain this to you as easily as possible!
Nicotine is a chemical that is found in cigarettes and other tobacco products. When you smoke, you breathe in the nicotine and it goes into your body. Over time, your body gets used to having nicotine in it, and it starts to depend on it. This is called addiction.
But when you decide to quit smoking, your body has to adjust to not having nicotine anymore. This can cause something called withdrawal, which means your body is going through a bit of a tough time because it's not getting what it's used to.
Some people might experience different symptoms of withdrawal, such as feeling really anxious or irritable, or having trouble sleeping. They may also feel more hungry or have a harder time concentrating.
But this doesn't mean you should keep smoking! Nicotine is really bad for your body, and quitting smoking is one of the best things you can do for your health. Plus, the withdrawal symptoms won't last forever - they usually go away after a few weeks.
So, if you're trying to quit smoking and you're feeling a little bit crummy because of withdrawal, just remember that it's totally normal! And if you need help, talk to your doctor or another adult you trust.