Given that Parkinson's is a disease in which the neurons in the brain stop producing dopamine, it's just as possible that his drug use was treating his conditio

Given that Parkinson's is a disease in which the neurons in the brain stop producing dopamine, it's just as possible that his drug use was treating his condition, not worsening it. From what I can tell, Parkinson's doesn't have a direct, established environmental cause. Just some candidates which may increase risk. Note: I'm not an MD or have any background in medicine.