The most harmful chemicals in smokeless tobacco are called tobacco-specific nitrosamines (TSNAs). These chemicals can cause cancer. TSNAs are formed as tobacco is grown, cured, fermented, and aged. The amount of these chemicals in smokeless tobacco can be very high.
Other harmful chemicals in smokeless tobacco include:
- Polonium 210 and lead 210, rare radioactive elements
- Arsenic
- Benzene
- Lead