The teeth are the first victim of smoking. As the smokes smoke tar sticks to the teeth, it changes their color into an ugly yellowish shade of brown. At the same time cigarette smoke prevents blood from nourishing the gums, slowly but inevitably making them weak. This may effect in swelling and mouth inflammation, but most importantly it makes gums to grow weaker and weaker with every passing year, making it impossible for them to act as the teeth support.
Lack of proper circulation in gums causes severe risk of teeth loss. This is not theoretical! A teenage smoker loses between four and six teeth before he reaches his mid-thirties. Poor blood circulation in the mouth often results also in other problems, most notably complications after dental operations. For example, smokers are more likely to suffer of a dry-pocket.