Smoking rates in the US have hit a record low, according to a new study from the CDC, though the findings reveal smoking rates remain high for American adults who are uninsured or on Medicaid.

Published in this week’s Morbidity and Mortality Weekly Report (MMWR), the new study revealed that overall smoking rates among adults in the US have fallen from 20.9% in 2005 to 16.8% in 2014 – the lowest rate on record. Between 2013-14, smoking rates fell by 1% alone.

Additionally, the study revealed a reduction in the average number of cigarettes smoked daily, falling from 16.7 in 2005 to 13.8 in 2014. The researchers say this result was steered by a reduction in the overall proportion of adults who smoke at least 20 cigarettes daily.