THE HAGUE, Netherlands — With slogans like “Don’t let your vote go up in smoke!,” owners of the free-wheeling cafes where bags of hashish are sold alongside cups of coffee are mounting a get-out-the-stoner-vote campaign ahead of next week’s Dutch election.

The campaigners are calling on their sometimes apathetic dope smoking clientele to get out and support political parties that oppose the recently introduced “weed pass” that is intended to rein in the cafes known as coffee shops and close them altogether to foreign tourists.

At a coffee shop in The Hague, a member of staff selling weed wears a T-shirt emblazoned with a modified Uncle Sam-style poster calling on smokers to “Vote against the weed pass on Sept. 12.” Under the new system, coffee shops become members-only clubs and only Dutch residents can apply for a pass to get in. The cafes are limited to a maximum of 2,000 members.

The online campaign offers cannabis and marijuana users voting advice by showing which political parties support dumping the “weed pass,” which came into force in the southern Netherlands earlier this year and is intended to roll out over the whole country in coming years.

Joep Oomen of the legalize cannabis movement says it’s hard to know exactly how big the pot-smoking constituency is, but he estimates it at half a million in this nation of 16 million.

Basically the advice to them boils down to this: Voting for any political party on the left is good, any party on the right is bad.

One champion of the smokers’ lobby is Socialist Party leader Emile Roemer, a jovial 50-year-old former teacher whose party is expected to make significant gains at the Sept. 12 election.

Speaking at an event this weekend, Roemer called the weed pass “incredibly stupid” and vowed to scrap it if he wins.

He said the pass system simply pushes drug dealers onto the streets and out of the controlled environment of the coffee shops — “so stop the wietpas,” he said, using its Dutch name.

Jerome Croonenberg, enjoying a joint at The Hut coffee shop in a side street close to the parliament building, said he would be voting for Roemer because of his coffee shop policy. “I will vote to keep coffee shops open so I can keep smoking,” he said.

The center-left Labor Party, which is surging in pre-election polls thanks to strong performances by its leader Diederik Samsom in televised debates, also advocates scrapping the pass and replacing it with legislation that would further enshrine tolerance of marijuana in Dutch law and regulate not only coffee shops but also growers.

However, the coffee shops still have a fight on their hands — the conservative VVD party of outgoing prime minister Mark Rutte is topping polls and looks set to become the biggest single party. It was a VVD-led coalition that introduced the weed pass and it is standing by the policy.

Coffee shops have long been tolerated because authorities believe they keep dope smokers away from street dealers of more dangerous and outlawed drugs like cocaine and heroin.