Now, a new study from Mayo Clinic has some startling numbers to back that up. And it brings attention to dangers of exposure to secondhand smoke. "450,000 Americans every year die of tobacco-caused disease, and that's like three fully loaded 747s crashing everyday, 365 days a year, with no survivors," said Dr. Richard Hurt.

KIMT, by Raquel Hellman, 11/18/11

Tags: Nicotine Dependence Center