How should I confront a mother who smokes in her house around kids?

Yesterday I made this post about the mother of my son's classmate who chain-smokes in her house around kids and openly post about it on her Instagram.
https://similarworlds.com/life/5425147-How-do-people-like-her-even-get-to-keep-their-kids

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All of you seemed to agree that reporting her to CPS would likely be just a waste of time. But do you think confronting her about her smoking habit via a DM could make her at least think about her behavior?

I'm not comfortable letting my son visit their place anymore knowing exactly how much she smokes and how nasty the smell in their house is. And I'm genuinely concerned about the well-being of her young daughter.

I just can't quite figure out what should I write to her... Any help would be appreciated!

JackDaniels · 46-50, M

You could DM her and tell her you son cant go over anymore because of her smoking. Are you concern how little she wears?

missA · 31-35, F

@JackDaniels I'm not sure I would wanna tell her that, cause I don't wanna make it sound like my son can't be friends with her son anymore...

And obviously her overly sexual outfits are a concern too especially given that I've heard from other parents that their kids have seen her topless in the garden when they have been visiting.