I think from my experience working in the city working and living where I do, cocaine and alcohol abuse is normalised….
There is more people doing it than not… no kidding…
Everyone on it thinks everyone is doing it and so it is ok. (It isn’t)
If you aren’t confident then you tell him so. If he doesn’t accept this then you involve his family – out him on his ways (as long as he hasn’t got anything to throw back in your face) failing that, speak to social services or have meetings together with your baby so you always have the control and assurance x