Nothing wrong with not going over to his house for long periods of time. Does he live close enough that you could go over for supper only, and ask him super sweet with a cherry on top, if he could just step outside to have his smokes during the few hours you are there?....I do find that smokers have the ability to put their "addiction" on very low priority, as if it should be like second nature to everyone else like it is to them. My husband smokes, it is very hard for the kids and I to deal with. We do have an agreement that he not smoke in the house, and he doesn't during the week, but on the weekends when the weather is cold he will sit by the sliding glass doors in the dining room and have a cigarette, he doesnt understand that it comes into the house and the kids and I have to breath it aswell, he will also smoke in the car, GGRRRR! makes me furious and upsets the kids, but like I said, their addiction is so overwhelming to them that they think what is second nature to them, should be to all those around them....IMO, that is a very selfish attitude. Although I completely understand that your fathers home is his home and if he chooses to smoke in it, there is nothing you can really do, but...if you asked him to kindly use the out doors during a short visit due to your medical needs (migraines are no fun) if he loved you, there should be a middle ground you both could find in order to be together. NTM if going to his house is too dif for you? invite him to yours....pretty sad that his addiction could possibly get in the way of your relationship and time spent together, I hope you can come to an agreement somehow!