Which chemical in tobacco causes a smoker to be addicted to smoking?

تمباکو میں کون سا کیمیکل ہے جو تمباکو نوشی کو تمباکو نوشی کا عادی بناتا ہے؟

Ammonia

Carbon monoxide

Tar

Nicotine

Tobacco products are addictive because they contain nicotine.

Nicotine keeps people using tobacco products, even when they want to stop.