Study shows many think marijuana causes little harm

Marijuana use is going more mainstream, not only with more states allowing its use in some form -- including five more set to vote this November --but also in the way Americans view the drug itself.

According to a new study published in the journal Lancet Psychiatry, substantially more people feel that using Marijuana causes little to no harm.

"Beginning in the 90s with medical marijuana laws, we have seen large amount of people using marijuana themselves and deciding themselves whether it was harmful to them," Roger A. Roffman, a professor emeritus at University of Washington, School of Social Work told ABC News.

"The idea that marijuana is harmless has been far too widely accepted by people," he said. "I want to see that pendulum switch back towards accuracy and for us to be more tuned in to what people need to make informed decisions."

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