Quit Smoking: Smoking not only increases the LDL (low density lipoproteins, the bad cholesterol, while decreasing HDL (high density lipoproteins), the good cholesterol levels. This damages the arteries. The nicotine in cigarettes can also lead to heart palpitations. Smoking also makes the blood stickier by raising fibrinogen levels and platelet counts. Carbon monoxide from cigarette smoke also raises blood cholesterol levels. Research has found that giving up smoking leads to the rising of the HDL levels and depleting of the LDL levels. Within 24 hours of quitting, risk of a heart attack subsides. Due to all the above, it is proven that it makes sense to quit smoking.