Ozzy Osbourne has died

To be fair, from the casual glance over the causes of Parkinson's, it doesn't seem as if alcohol or drugs are probable causes of Parkinson's.

Now, if he got something with pesticides or whatever still on it, sure, but Parkinson's is relatively murky with regards as to what causes it.

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.