More Americans are using marijuana, and fewer people think that regularly doing so is harmful.

The new study shows that from 2002 to 2014, the number of American adults who used marijuana in the last year increased by 10 million and the number of people who used it daily increased by more than four million. More adults also started using marijuana for the first time. Yet there was not an increase in reported marijuana abuse or dependence.

The study, which was published in the The Lancet Psychiatry, surveyed over 50,000 adults between the years 2002 and 2014. Interestingly, the researchers also observed a drop—50% to 33%—in the number of people who thought that smoking marijuana once or twice a week was harmful.