Exposure to personal smoke and secondhand smoke increases the risk.

In non smokers, secondhand smoke is the cause of about 20 of cases.

The use of tobacco products or exposure to secondhand smoke during pregnancy has been linked to low birth weight.

I had bought a copy of this book, The Universe and Dr. Einstein a used paperback from a secondhand bookstore in Seattle.

Have you ever bought a book at a secondhand bookstore and found something unexpected left inside that the previous owner used as bookmark?

The only indoor quality work done in this country at that time was sponsored by R.J. Reynolds Tobacco Company, and it was to prove there was no danger from secondhand smoke in the workplace.