The injured gums pull away from the teeth, exposing root surfaces and leaving teeth sensitive to heat and cold. Erosion of critical bone support leads to loosened teeth that can be permanently lost. The sugar reacts with bacteria found naturally in the mouth, causing an acid reaction, which leads to decay. Moreover, the habit of continually spitting can be both unsightly and offensive. Nicotine blood levels achieved by smokeless tobacco use are similar to those from cigarette smoking.
Nicotine addiction can lead to an artificially increased heart rate and blood pressure.
In addition, it can constrict the blood vessels that are necessary to carry oxygen-rich blood throughout the body. Athletic performance and endurance levels are decreased by this reaction. Chewing tobacco lessens a person's sense of taste and ability to smell. As a result, users tend to eat more salty and sweet foods, both of which are harmful if consumed in excess. This can result in a condition called leukoplakia.