third-hand smoke

You know the smell that’s left on clothes, furniture and hair after being around cigarettes? Turns out the chemicals causing that smell, dubbed “third-hand smoke,” offer a whole new kind of cancer risk. When cigarette smoke mixes with nitrous acid — a common household gas emitted by gas appliances and cars — it creates new carcinogenic chemicals called tobacco-specific nitrosamines. Some of this happens with second-hand smoke, but the process continues as the smoke settles. That means even nonsmokers are exposed, often through skin contact, and the exposure can persist. Time to toss that stinky sofa — and get serious about smoking outside. (Via Scientific American and the Contra Costa Times.)

Photo by Mathew MacQuarrie on Unsplash.