Smokey~~
I know exactly where you are coming from -- my daughter's father is a heavy smoker (as is the rest of his family/friends) and my daughter would come home from visitations reeking of smoke! We were 500 miles apart and would meet halfway for dropoff/pickup and I would always bring fresh clothes with me because I couldn't stand to even leave her in the stinky clothes all the way home -- not to mention that she had several respitory problems the first couple years ...... funny, always right after a visit...go figure!
Anyway, you are looking for advice, not another sob story so here goes --- with the current flux of information on just how bad second-hand smoke is (and most especially for young children by the way) it is actually more common than not that you can find ways to have the issue addressed in custody orders. Depending, of course, on the attitude of your local magistrate that is. So happens ours had a family history of problems caused by smoking and was therefor more sympathetic to my plea -- the father is under order not to smoke withing any closed are in my daughter's presence (including car during transport, house, etc...). When presented with the evidence from my dr - the reports of the illnesses along with supporting documents to show the proximity to visitation dates - it was pretty obvious that the continuous exposure to the smoke she was getting was the main cause of the issue.
My best advice to you is to start contacting family law attorneys in your area and take them up on the "free consultation" until you find one who seems to agree with you.....best chance of winning is to have an attorney who is actually on your side
! Or, you can try an internet search for childrens/father's rights groups and contact them - they can direct you to attorneys as well.
In my opinion, this amounts to nothing short of child endangerment on your ex's part -- we all know what smoke does to kids, and how anyone could wish that upon an innocent child, I don't know.....your challenge, however is going to be convincing the judge. Start getting statements from physicians, the American Cancer Society, anywhere you can think of and get yourself ready to fight -- at least you know you will be fighting the good fight as you are fighting for the health/life of your child.
Good luck and God Bless