Teenagers around the world are exposed to tobacco smoke at an alarming rate, whether or not they are themselves smokers. According to a new UTMB study, as many of two-fifths of teenagers who do not smoke are still exposed to secondhand smoke. The study provides a first-ever global perspective of how many young people are exposed to secondhand smoke. The study also showed that teenagers who know about the dangers of smoking have a higher rate of exposure to secondhand smoke. That suggests the mere knowledge of dangers about smoking is not enough to protect teenagers, lead author Phani Veeranki said. [Note: Paid subscription required. Contact UTMB Media Relations for details.]