Answer:
The correct answer is nicotine.
Step-by-step explanation:
Nicotine is present in tobacco which is addictive in nature and makes the person dependent on it. Apart from nicotine tobacco contains thousands of chemicals out of which several are cancerous for humans.
So nicotine replacement therapy is used for addictive people to prevent them from smoking tobacco. In this therapy special gums, sprays, inhalers are used which contains a controlled amount of nicotine that reduce the cravings for tobacco and help with smoking cessation. So the correct answer is nicotine.