They're also grown with high phosphate fertilizers which produce a lot of decay products ending up in Po-210. THEN they aren't washed, and THEN they're dried un

They're also grown with high phosphate fertilizers which produce a lot of decay products ending up in Po-210. THEN they aren't washed, and THEN they're dried under gas heaters which promote the formation of Tobacco-Specific Nitrosamines, which are incredibly carcinogenic. One of the many reasons why, even though smoking anything is not great for your health, smoking tobacco is particularly harmful.