You can’t control whether a relative smoked in the house you grew up in, whether the factory near your childhood home leached chemicals into the groundwater, or whether the air outside your apartment has fine particulates floating through it on any given afternoon. But oncologists —the doctors who spend their careers thinking about why people develop cancer—are clear about one thing: There’s a long list of exposures inside your home that you can actually do something about. “How we sleep , what we breathe, what we eat , what we drink, what we expose ourselves to—all of these things definitely factor into your physical and mental health,” says Dr. Michael Dominello, a radiation oncologist at Karmanos Cancer Institute in Detroit. “By making no decision, you're actually making a decision, oftentimes for the worse.” We asked four oncologists to describe the changes they've made in their own houses to reduce their daily exposure to chemicals , pollutants, and carcinogens . Here are eight of them.…