Confronting husband about his addiction

Hi- I don’t know where else to seek help but I’m just looking for some reassurance. My husband and I are currently separated and we co parent a 4 year old. He has a past with opioid abuse, and he is unaware that I know he has a Kratom addiction. I still have access to his bank account and he is spending at least $1000/week at smoke shops on this. His physical appearance has completely deteriorated, he’s losing his hair, he’s sweaty and shaky often when I see him among many other things. It’s heartbreaking.

I have a friend/father figure that is having lunch with him today to confront him about the addiction and offer to get him help. I’m so nervous about the fall out and backlash and I’m really just looking for some reassurance that this is the right thing to do.