Studies find out that smoking contributes to a lot of heart diseases. In fact, it’s found that smokers have witnessed a two to four-fold increase in coronary artery diseases and a 70% higher death rate as compared to non-smokers. This is because smoking causes atherosclerosis or a buildup of fatty substances in the arteries. This causes the inner lining of the arteries to weaken and be filled with fat and plaque deposits that impedes blood flow. Since enough oxygen-rich blood can’t reach the heart, this can increase chances of heart attack.