It's not very well known, but the tobacco growers use Polonium 210, which is radioactive, to help grow. This is what causes the majority of tobacco-related cancer cases. Even former U.S. Surgeon General C. Everett Koop acknowledged this.
I quit over 15 years ago.

http://www.acsa.net/HealthAlert/lungcancer.html

http://www.google.com/search?sourcei...bacco+polonium