Some 34 million US adults smoke cigarettes, according to a 2017 survey by the US Centers for Disease Control and Prevention.
The 14 percent cigarette-smoker rate is down from 15.5 percent in 2016.
The current rate marks a 67 percent decline since 1965, the year the National Health Interview Survey (NHIS) began collecting annual data on smokers, said the CDC report.
"This new all-time low in cigarette smoking among US adults is a tremendous public health accomplishment," said CDC Director Robert Redfield.
The NHIS report also highlighted a significant drop in young adult cigarette smokers in 2017 compared to a year earlier.
About 10 percent of Americans aged 18-24 smoked cigarettes in 2017, down from 13 percent in 2016.