I haven't experienced it myself though I have felt it close sometimes. Almost everyone in my family has some mental health issue.

But I have seen a friend having one. While he wasn't aggressive he was weird and unpleasant. At the end he had estranged most of those around him and we no longer have contact lol. Oh and that was the second time he had one, the first time he jumped from a balcony.
No idea if they have mental illnesses in their family though.

Just don't smoke heavily and you should be fine.
Like once in a month maybe.