In all seriousness, these days everything causes cancer. I will be replacing old creosote beams under the house at the Hill with these. Living up there it will be a race to see if the Radon or the Creosote gets me first.
I do not have a reaction to creosote like a lot of people do, my Dad gets a rash like poison ivy from it. By the time I am done with things it will be ventilated well enough that there shouldn't be a Radon or Creosote issue. I have seen houses that the entire floor joist system were coated in creosote, at least the beams I am dealing with are separated by the floor joists, also see "log" cabins made from railroad ties. I don't think I could handle that, these beams aren't nearly as fresh, so there isn't much odor left. I say that, but I used to walk the railroad tracks as a kid and I can remember the smell, frankly it is almost associated with good times. We used to jump off the RR bridge into the river for fun.