McGwire has raised awareness about the dangerous habit, and is a positive role model for all athletes who are, or are considering using smokeless tobacco. Smokeless tobacco contains many chemicals and additives that cause addiction and cancer. One can of smokeless tobacco contains the same amount of addictive nicotine as 60 cigarettes. Polonium 210, Cadmium, Cyanide, Arsenic, Benzene, and Lead. Smokeless tobacco causes cancer of the mouth and throat.
Smokeless tobacco causes many dental problems as well.
The grit and other irritants in the product cause the teeth to erode, and the gums to recede. The jawbone under the gums can also be damaged, and cause the teeth to become loose or fall out. Smokeless tobacco can permanently discolor the teeth, and its high sugar content increases tooth decay. If that isn't bad enough, smokeless tobacco can also decrease the ability to smell and taste food. The social effects of smokeless tobacco use are also worth noting.