I suppose there are some people who drink casually after having been addicted. I really don't know. Stranger things have happened.
But when you sort of take a bird's-eye view of this scenario:
The man's in REHAB. That is a big deal. And now instead of thinking: "Damn, how can I rebuild my life? How can I repair the damage I've done to my reputation and my relationships?" his chief concern is "WHEN CAN I START DRINKING AGAIN?"
Yeah, no.