There are some provisions designed to entice backers or blunt opposition.

It would impose a 16% tax on sales that proponents say would generate $300 million a year in new revenues to fund community colleges, public safety, health programs, and for the construction and repair of roads.

There also is a prohibition on sales to anyone younger than 21. And the measure would bar the sale of marijuana products that resemble humans, animals, insects, fruits, toys or cartoons — think gummy bears — or sell or advertise marijuana with names or designs that imitate food or drink brands marketed to children.

But Lisa James, heading Arizonans for Health and Public Safety, said none of that ensures that items won’t be marketed to kids. She said the list of what’s prohibited in designs leaves a whole host of what remains legal, like gummies with marijuana in the form of sports cars.

James also said it will lead to more accidents as motorists who are high get behind the wheel.

Campbell said the measure contains a ban on driving while impaired.

But he conceded there is currently no technology, similar to a breath test, to determine the level of THC, the psychoactive ingredient in marijuana, in someone’s blood. And even if such a device becomes available, there is no standard in the proposal to say that a specific THC level is a presumption of driving impaired, the way someone with a blood-alcohol level is presumed to be driving drunk.