From Science Daily, Carcinogens form from third-hand smoke. This is seriously disgusting. I remember getting some free clothes and toys from a family through craigslist a couple of years ago. When I arrived at their house to pick up the items, I realized that they were heavy smokers. I washed the clothes repeatedly, and I washed and air-dryed the toys. Even after weeks outside, the doll hair still stunk of old tobacco smell. I finally had to give away all the stinky toys. Good thing I did, as according to this article the smoke residue was dangerous to my children's health.
CT - homeschooling mother of girls.
Animal Aficionada - A girl who likes to keep track of and share the interesting things she learns about animals.
Space Girl - Copied sister above and now has a little blog about space facts.