Gov. John Hickenlooper said Thursday the biggest factor that could send a marijuana consumption clubs bill up in smoke are health concerns surrounding the measure.

A bipartisan bill in the legislature, Senate Bill 63, would allow for marijuana consumption clubs. Licenses would be issued to establishments where retail or medical marijuana could be sold and consumed. Clubs would be limited to people at least 21 years old.

Under the bill, all marijuana products would be consumed or disposed of at the club.

“Just because that smoke makes you happy and dumb doesn’t mean it’s good for people,” Hickenlooper said when asked by reporters following remarks before the Colorado Municipal League inside the History Colorado museum in Denver.

Hickenlooper opposed efforts in Colorado to legalize retail marijuana.

Supporters of the social consumption bill in the legislature are optimistic given the bipartisan nature of the bill, sponsored by Sen. Vicki Marble, R-Fort Collins, and Rep. Jovan Melton, D-Aurora.

Senate Republican Leader Chris Holbert of Parker said this week that he is open to the idea, but that any legislation must protect local control.

“Communities like Denver have a legitimate issue. There are people coming to Colorado in all or part to experience the legalization of marijuana, and yet they can’t consume in public, they can’t often consume in their hotel rooms. Where are they supposed to go?” Holbert said.

“I would very much like to see this off of the street. I don’t like smelling it on the 16th Street Mall, I’ve been panhandled between here and the mall for marijuana

“It’s clearly a problem that needs to be addressed, why wouldn’t we embrace local control and allow communities to handle it in the way that works best for that community.”

Lawmakers were expected to hold a hearing on the marijuana clubs legislation this week, but it was delayed as negotiations continue. Discussions are taking place about whether to remove medical marijuana from the bill.

The legislation would protect local control by leaving it up to municipalities to decide whether to allow clubs in towns and cities.

Where Hickenlooper is most concerned is over an exemption that would be given to clubs from the state’s Clean Indoor Air Act, which prohibits smoking in most public places. Cannabis clubs would have to be fully ventilated.

The governor said the state worked hard to protect employees at places such as bars and restaurants by prohibiting public smoking. He worries that there could be similar negative impacts from second-hand marijuana smoke.

“We spent a long time letting everybody know that smoking is bad for you,” Hickenlooper said.

The governor declined to say whether he is leaning towards vetoing the bill if it makes its way to his desk, stating that he hasn’t reviewed details of the legislation yet.

The other concern is whether allowing marijuana consumption clubs might invite federal blowback under an uncertain Trump administration led by Attorney General Jeff Sessions, an ardent critic of marijuana legalization.

“I don’t know whether we’d be inviting federal intervention,” Hickenlooper said. “That’s one argument that I’ve heard used persuasively.”