WWYD? ExH behaviour when DCs are in his care.

[OnceMoreIntoTheBleach]

Two adults (ex and his gf) smoking in the house when the DCs are there (in kitchen with door shut, but DD says it's still smoky when they are allowed back in). 

His gf lives in an upstairs flat, so no easy route outside, but he used to use a vapourizer so it's annoying that he's not doing that instead. 

The DCs only visit in school holidays but for a few days at a time. He lives 200 miles away. I am primary parent.

I'm really cross about it and want to put my foot down over it. Can I? 

Also, letting them watch age-inappropriate films, letting them play out in a nearby field while he is asleep, and DCs coming home after a 7-day visit having had not bath/shower.

DCs are 8 and 6.

I am concerned about them being in his care. AIBU?

[Lonecatwithkitten]

Smoking alone in the house is not something you can raise ( been there had legal advice) combined together with other concerns about the lack of care for the welfare of the children. I had other concerns too I took legal advice got all of my ducks in a row and acted.