If he's nodding off it sure doesn't sound like crack to me,it sounds more like some type of opiate,maybe even heroin.But the face sores,maybe crack or meth?

If he's 34,there's not really much you can do to help or stop him,all you can do is speak to him,tell him of your suspicons and set boundaries with him,like not being high at your house,no using in your house,etc.

Sorry you are going through this.