To a child on the prowl for sweets, that brownie, cookie or bear-shaped candy left on the kitchen counter is just asking to be gobbled up. But in states that have legalized marijuana for recreational use, notably Colorado, that child may end up with more than a sugar high.

A study published on Monday in the journal JAMA Pediatrics says that in Colorado the rates of marijuana exposure in young children, many of them toddlers, have increased 150 percent since 2014, when recreational marijuana products, like sweets, went on the market legally.

When children get their hands on the goodies they can become lethargic or agitated, vomit and lose balance, triggering a hospital visit or a frightened call to a poison center. A handful of patients were admitted to intensive care units and intubated.

Rates had started climbing in 2009, when the federal government said it would not prosecute users and suppliers who conformed to Colorado’s medical marijuana laws. Those patients often ingested their prescription marijuana through baked goods.