Exposure to passive, or secondhand, tobacco smoke increases a person's risk for experiencing a variety of respiratory ailments, according to the results of a large international study.
What's more, exposure to secondhand smoke varies widely around the world.
For example, people exposed to secondhand smoke in the workplace varied from less than 3% of those in Uppsala, Sweden, to 54% of the participants living in Galdakao, Spain, the report indicates.