Smoking constricts blood vessels. If you are prone to circulatory problems, smoking only makes them worse. Smoking has been implicated as a primary cause of Buerger's Disease, which triggers inflammatory changes in small and medium-size arteries and veins and can lead to gangrene and even amputation if the patient continues to smoke. The risk increases if you're also obese and have high blood fat levels. Smokers with high blood pressure have a 20-fold increase in the risk of stroke.
Heavy smoking can make it harder to taste foods and discriminate among smells.
It is now well documented that secondhand cigarette smoke can cause or aggravate diseases in others around you. These include respiratory problems and allergies. Co-workers, spouses, children, even pets can be affected. Tobacco smoke contains about 4,000 chemicals. Further, many of the chemicals in cigarette smoke have been shown to cause cancer.