Grab that jumbo bag of M&M’s and fire up the bong: A majority of Americans now support legalizing marijuana, the first time public opinion has swung that way in more than 40 years of pot polling.

And the increase in support is reflected among all demographic and political groups, according to the Pew Research Center: Baby Boomers and Gen Xers, Democrats, Republicans, blacks and whites.

“The long-term shift in favor of legalizing marijuana has accelerated in the past three years. About half (52 percent) of adults today support legalizing the use of marijuana, up from 41 percent in 2010,” the Pew report stated.

These numbers should reignite a conversation about current pot laws. With all the foot-dragging on its medical uses, this could be the sensible solution: Decriminalize small amounts (for starters), and get the state out of regulating the medical marijuana business.

Assemblyman Reed Gusciora (D-Mercer) thinks that’s the way to go. Today, if you’re caught in New Jersey with one joint, you can get up to six months in jail, a $1,000 fine and have your driver’s license suspended for six months. You’ll also be on the hook for hundreds of dollars in penalties — with a criminal record that follows you forever.

Gusciora introduced a bill last year decriminalizing a half-ounce of marijuana, making the offense the equivalent of a parking violation. A first offense would draw a $150 fine, a second offense a $200 fine, and a third $500. Violators under 21 caught with marijuana or adults busted three times would have to attend a drug education program.

Gusciora's bill passed the Assembly but got stuck in the Senate, where Sen. Nicholas Scutari (D-Union) introduced a more lenient measure, increasing the legal amount of pot to 2 ounces. Scutari says he's open-minded and would consider Gusciora's version.

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That’s good to hear.

Law enforcement officials dislike using precious resources on this kind of petty crime, said Gusciora, who saw pot cases clogging the courts when he was a municipal prosecutor in Trenton. He still sees it today as prosecutor in Prince­ton and Lawrenceville.

“We need to move on,” he said. It’s time.