Which statement about population exposure to nicotine from environmental tobacco smoke is TRUE?

• A. Detectable nicotine exposure among nonsmoking Americans declined between 1988 and 2008.
• B. Detectable nicotine exposure among nonsmoking Americans roughly doubled between 1988 and 2008.
• C. Nicotine exposure trends among nonsmokers show no change from 1988 to 2008.
• D. Nicotine exposure among nonsmokers increased only in rural populations while decreasing in urban populations between 1988 and 2008.

Answer: (A)