Anyone paranoid of cancer should probably focus on other things, such as your diet (i.e. Don't eat anything containing preservatives such as sodium nitrite, artificial sweeteners such as Aspartame, food coloring - Yellow 6, blue 1 and 2, etc...). These are things we consume on a daily basis which probably pose a much higher risk of causing cancer than cement houses.
12 Dangerous Food Additives: The Dirty Dozen Food Additives You Really Need to be Aware Of
12 Dangerous Food Additives: The Dirty Dozen Food Additives You Really Need to be Aware Of