Answer:
The correct answer is - addicted to nicotine.
Step-by-step explanation:
Addiction to smoking is related to the consumption of nicotine. Regular smoking or vaping nicotine releases the dopamine hormone in the brain. Dopamine trains the brain and neurons to repeat the activity again and again which leads to the addiction to nicotine as dopamine is a rewarding hormone. This addiction to the nicotine makes an individual like Sandra keep on smoking and make it tough to quit it.
Thus, the correct answer is - addicted to nicotine.