Voters in Colorado and Washington on Tuesday approved measures allowing adults to use marijuana for any purpose, NBC News projected, marking an historic turning point in the slow-growing acceptance of marijuana usage.

In Massachusetts, voters also approved an initiative allowing people to use marijuana for medicinal purposes, NBC News projected. In Arkansas, a similar initiative failed, according to NBC News projections.

In all, voters in six states were being asked to decide on a wide array of laws around legalizing marijuana for medicinal or recreational purposes.

In three of those states – Colorado, Oregon and Washington – voters were deciding whether to allow people over 21 to use marijuana for any purpose. In Oregon, NBC News projected that the initiative to legalize marijuana had failed.

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