Industry leaders praised the commission’s efforts as a step toward more safety and public confidence in the legal pot market. Approval of the proposed rules would be important to help people know what they’re ingesting “for both safety and consumer preference,” said Joe Gilmore, president of Massachusetts Recreational Consumer Council.

“It sounds like a move in the right direction,” said Brandon Pollock, chief executive of Theory Wellness, a marijuana retailer.

The proposed rules are smart, but the commission should also consider banning flavors and testing cartridge hardware, which could leach heavy metals into vapor, said Chris Hudalla, a chemist who runs marijuana testing company ProVerde Laboratories.

“Flavorings are one of the hugest concerns for me,” Hudalla said. “When they permit things like cinnamon or banana or whatever, there could be some potential hazards.”