I have a DS (4) and I am 34 weeks pregnant. My DF smokes and I see them 5 days a week at their house for about 2 hours at a time, my DF smokes in what they call the 'outhouse' it's off the kitchen and leads out into the back garden, he smokes with the door leading to the house shut but then when he's finished he comes out and leaves the door wide open so all the smoke comes billowing out anyway. He doesn't open the door to the garden as he smokes as it's 'too cold' I have asked repeatedly that when me and my DS are there if he'll remember to keep the door shut, I know this doesn't eliminate the smoke but it minimises it yet he never remembers and my DM just says 'I keep telling him but he forgets' every time I come home from their house we stink of smoke on our clothes and hair. I feel particularly bad today as my DS is sleeping at their house tonight for the first time in over 2 years and I feel guilty about leaving him there knowing he is going to stink and be exposed to the smoke. Also, at 34 weeks pregnant I know it isn't great for me or the baby but I've just been googling the affects of passive smoking and it's made me terrified now. When the baby is about 5 weeks old we are booked to go on the Polar Express with DS and my DM has offered to have the baby overnight as we won't get back until about 11.30pm. She's so excited about having baby but I really don't want baby to stay there with all the smoke and her tiny lungs. I'd be worried sick about SIDS. Wwyd? I really don't understand why my DF can't just smoke in the garden with all the doors shut. My DS still lives at home (she's 26) and has SN and a chronic lung condition yet this still hasn't prompted him to be more cautious with his smoke.
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Agree with PP, it's their house and if despite being asked to change habits they haven't it doesn't seem that anything is likely to change. Second hand smoke isn't good and I'm not advocating for smoking, but a day here and there of second hand smoke wont do any damage, no more than city pollution would. Suppose it's about weighing up the pros and cons of kids seeing them or not 
if I were you I'd just go through to the smoke room and open the door outside without even asking and keep doing that until they got the hint! But that's just me
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