Like the previous poster, I have no tolerance for smoking/smokers AT ALL - and I am not one nor have I ever been one. My father smoked most of life (til I went to college - HA!) and my brother, sister, and I as well as my mom all suffered from chronic bronchitis, asthma, allergies, including at least one ER visit apiece for us each year. He also burned us by accident several times each when we were young and didn't watch where WE were walking! Then he got mad at US for walking into his cigarette, even though he felt bad we got burned! He smoked sitting in his recliner, at the dinner table, in the car. He was a 3-pack-a-dayer for 25 years til he finally got so sick he had to quit for 3 days, and by then the worst of his withdrawals were past so he "stayed clean"... I was proud of him for doing it, and although I've never been addicted to it or anything else, I know how hard it was for him and have seen other family members struggle with it unsuccessfully. And to echo the previous poster - my best friend just lost her daddy in November to lung cancer - he smoked as much as my daddy did until about 5 years ago. But once she had kids (living with them for 3 years of the first one's life), he kept the smoking to the bedroom and the kids weren't allowed back there. Then he quit altogether. He still died at age 57 and these kids who were so close with their grandaddy have to grow up without him now.
I see SO many people who smoke and have kids that have BAD asthma and other medical problems, and they still smoke around them. When I was a kid, and I had to be around it, like in the car, I would bury my nose/mouth into my shirt, or something else to get out of the stream of smoke. (I am sure it didn't help much since my clothes must've wreaked of the smoke as well!) To this day, I subconciously hold my breath if I have to go into a gas station until I figure out if it is a clean, non-smoking or a trashy one...
If I were in this situation, like my BF did, and like you've done, I would INSIST that no one smoke ANYWHERE around my kids, including in the house at all, or the car, or in public places. And if YOU could kick the habit, that would teach your children that it is something you shouldn't do and that once you get addicted, it is HARD to quit, so to never start. Yours are so young, they may not even remember you smoking. My kids & hubby can't picture my dad with a cigarette, and it is still weird (17 years later) for me to see him WITHOUT one. If this health issue is as important as you think it is, you will find a way to quit - for your kids, for your parents, and most of all for your own health.
Your husband is deployed right? He is risking his life for our sakes, for our country, for our freedom - what are you risking YOURS for? :) Surprise him on his homecoming by being a healthier, happier wife!
I say all of this with love, not condescension - I pray you will find the answers you are seeking... Your family may be upset with you at first, but if they love you unconditionally (and obviously they love you ALOT to move near you and be your support at this time), they won't hold a grudge for long, as long as their contact isn't being completely cut off. You love them, they love you, you all love the children. Everyone involved needs to act like adults and do the right thing!
God Bless!
A.