How do nicotine and tobacco cause cancer? by decreasing blood-sugar levels by damaging or changing a cell's dna by increasing heart rate by increasing phlegm and mucous production

The correct answer option is B. by damaging or changing a cell's DNA.

Explanation:

Nicotine and tobacco are harmful substances that are found in (commonly used) drugs such as cigarettes.

The smoke that comes from burning the cigarette contains tar that badly effects the lungs by building its high amounts in it which ultimately causes swelling of the air passages.

Also, the smoke attacks the DNA in one's cells and thus causing damage and change in it.

there is no options  

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answer 2 is the right one. jim should measure his snack to make sure he is using the right serving size.