Worried about the father of my child.

So last night he came home and I noticed the smell right off. Needless to say he is back to smoking crack after being off of it for a few months now. We are not together but do live together until I can save some paychecks up to move into my own place. Our son won't be here until September 1st sometime or another so I hope he can overcome this soon. I'm just so worried about him and don't want to see him suffering with this addiction again.