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!

IminPampers · 51-55, M

People should keep their opinions about how other peopke live their lives to themselves, it's none of anyone else's g*d damn business. I'm really getting tired of this new practice of everybody sticking their noses where they don’t belong. What gives anyone the right to police other people's lives. People who stick their noses jn other people's business are lucky they don't get their noses broken for their troubles.