According to the Centers for Disease Control nearly one in 12 Americans have asthma.
In 2009, a national survey of 40,000 people showed 8.2 percent suffer from the respiratory disease. Four years earlier the rate was just under 8 percent.
CDC officials say better diagnostic efforts could be the reason for the increase.
Each year, more than 3,000 people die from asthma in the United States.
