Respuesta :

2-4 I thought it was

Smoker's risk of heart attack is 2 to 4 times the risk of nonsmokers.

What are the effect of smoking on heart ?

Chemicals present in cigarette smoke can thickens the blood form clots inside veins and arteries.

This type of blockage in veins and arteries can lead to heart attack.

To know more about side effects of smoking:
https://brainly.com/question/1178363
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