> Colleen McBride, director of the cancer prevention, detection and control program at Duke University Medical Center... says there is a growing body of evidence that nicotine actually relieves some symptoms of Parkinson's and Alzheimer's disease, and appears to help those with severe depression focus.
https://today.duke.edu/2001/08/mm_medicaluses.html
The question is, to what extent are current medical uses of such substances actually necessary, i.e. to what extent has it all been about getting those sales numbers up?