The strong relationship between smoking and ischemic stroke has been confirmed by many studies. And smoking has now also been found to increase the risk of subarachnoid hemorrhage by 2 to 4 times, but it is inconclusive whether it increases the risk of cerebral hemorrhage. Smoking also enhances the risk of other stroke risk factors, including systolic blood pressure and oral contraceptives. Oral contraceptive use and smoking have a synergistic effect in increasing the risk of cerebral infarction. Exposure to smoking (either passive smoking or secondhand smoke) is a risk factor for heart disease. Therefore, non-smokers are advised to stay away from smoking environments and smokers to quit.