My wife passed away one year ago. Eighteen months before that i refinished my wood floors sanding and staining and top coat of polyurethane. We stayed in the house slept in a spare bedroom. She had breast cancer 5 yrs prior to when she passed away a yr. ago plus she was a diebetic for 41yrs. she was 59 yrs old. I have been having a hard tie and feeling did doing the floor eighteen months prioe to her death did doing the floor could of had anything to do with her lung cancer. she was helping me one day staining and got sick n vommited she didnt have on a mask so i told her to stop. I dont do floors for a living it was a one time job.