Just reading the news about Matthew Perry's death and keep reading about how he had demons. He didn't have fucking demons. He had an illness. People wouldn't describe having recurring cancer as 'having demons'.
It's the same thing. He didn't choose to be ill or be an addict. I know this thread is not going to make a difference to anything or anyone but the distinction is important.
I have no idea whether he had 'demons' or not but addiction was not one of them.