Smoking is also linked to heart rhythm issues, such as atrial fibrillation and stroke https://journals.plos.org/plosmedicine/article?id=10.1371/journal.pmed.1004561 Just 100 cigarettes over the course of someone's life may be enough to raise their risk of heart disease and death, a new study suggests https://abcnews.go.com/Health/100-cigarettes-lifetime-increase-risk-heart-disease-death/story?id=127587002