Susan smokes cigarettes and is, by her own admission, addicted to them. The implicated in Susan's addiction is both a and b.
Option C is correct.
Within seconds of inhaling cigarette smoke, vape mist, or consuming chewing tobacco, nicotine releases dopamine in your brain, making you feel better. Over time, the brain begins to crave that feeling of nicotine and people need to consume more and more cigarettes to get the same good feeling.
Smoking causes cancer, heart disease, stroke, lung disease, diabetes, chronic obstructive pulmonary disease (COPD), including emphysema and chronic bronchitis. Smoking also increases the risk of immune system problems such as tuberculosis, certain eye diseases, and rheumatoid arthritis.
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