I have sat in a room with 75 cardio-pulmonary specialists and listened to them being told by their peer at the podium that research shows the primary cause of lung cancer in smokers is radioactive particles in tobacco. None of them batted an eye. The reason is the tobacco plant readily takes up polonium in rock phosphate fertilizer and stores it in it's leaves.

I have sat in a room with 75 cardio-pulmonary specialists and listened to them being told by their peer at the podium that research shows the primary cause of lung cancer in smokers is radioactive particles in tobacco. None of them batted an eye. The reason is the tobacco plant readily takes up polonium in rock phosphate fertilizer and stores it in its' leaves.