As perceptions of marijuana change, more American adults are using pot than ever before, and they're using it more often, a new study finds.

Over 13 percent of adults surveyed in 2014 said they'd used marijuana in the previous year, up from roughly 10 percent in 2002.

Also, daily or near daily use -- five days or more a week -- rose from less than 2 percent to almost 4 percent of adults during that time period.

"This increase has corresponded with the legal and social acceptance of marijuana, and so it is not such a surprise," said lead study author Dr. Wilson Compton, deputy director of the U.S. National Institute on Drug Abuse.

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Steven Reinberg ~ HealthDay News via UPI.com ~