I wouldn’t say I like it but when I specifically consider canon I think it’s pretty damn likely.

Oh, definitely. It’s one of those things that will probably never be clear cut undeniable fact but that’s one of a few things I would say are more likely than not. That and drug use, emotional abuse (possible physical abuse as well) and pre-series mental illness, I think it’s there just not talked about. (Those last three are for both Dean and Sam.)