when can I stop worrying about sids

So none of my family smoke, but my fiancés family does. His sister. His mother and his father. And they all smoke in their house, every time I leave there my hair and clothes smell of cigarettes.
I'm worried about taking my newborn up there.
I don't want them to hold her as their clothes and hands will smell and their house smells of cigarettes the second you go there.
And even if they visit my house they will still smell of it.
What should I do? 
My family live 15 minutes away and his  live up the road literally 5 minutes so that's another thing I don't want , is them there 24/7
I don't want to be selfish. But I do not want smokearound my baby as it can cause SIDS. And I hate it!