Williams also abused cocaine in the 70s and 80s. And there is some evidence that cocaine abuse is linked to Parkinson's type disease. http://www.jneurosci.org/

Williams also abused cocaine in the 70s and 80s. And there is some evidence that cocaine abuse is linked to Parkinson's type disease. http://www.jneurosci.org/content/jneuro/23/7/2564.full.pdf http://www.jneurosci.org/content/jneuro/23/7/2564.full.pdf