Question

question 15 (1 point)
which of the following statements is true of smoking cigarettes?
it has no effect on the heart.
it increases the amount of fatty acids and glucose in the blood.
smoking 10 cigarettes a day is more harmful than excessive heroin use.
smoking only one pack of cigarettes can lead to hypothermia.
cigarette smoking affects the cardiovascular system by increasing heart rate.

Explanation:

Smoking affects the cardiovascular system (contradicting "no effect on the heart"). Nicotine and other components in cigarettes increase heart rate, impacting cardiovascular function. The claim about 10 cigarettes being more harmful than heroin is unsubstantiated; one pack does not cause hypothermia; while smoking may affect blood lipids/glucose, the most directly supported true statement is about cardiovascular impact via increased heart rate.

Answer:

Cigarette smoking affects the cardiovascular system by increasing heart rate.