The cigarette smoking rate among US adults dropped to another all-time low last year, with one in 11 adults saying they were current smokers, according to government survey data released this week.

Cigarette smoking is a risk factor for lung cancer, heart disease and stroke, and has long been considered the leading cause of preventable death.

The preliminary findings from the Centers for Disease Control and Prevention were based on survey responses from more than 24,200 adults. In the survey, CDC officials defined current cigarette smoking as smoking at least 100 cigarettes in a lifetime and currently smoking every day or on some days.