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KUSA- The lingering question over what substances are in electronic cigarettes is something the FDA says has been on their radar for years. On Thursday, the agency announced proposed regulations which would address the question.

The FDA says the proposed rules would require companies to register with the FDA, report product ingredients, provide health warning labels and it would prohibit vending machine sales. The rules would also prevent companies from marketing new products without FDA review and would prevent the sale to anyone under 18 years old.

The regulations would take effect after a 75-day public comment period. FDA officials say they will consider the feedback they receive, but have not yet set a date for when the rules will be implemented.

Some local e-cigarette stores in the Denver area say the products they sell already list the ingredients inside, but experts, like 9NEWS health reporter, Dr. John Torres say the problem is that not all companies do.

"I think the majority of the companies don't. This is one of those things the government is stepping in and saying we want everybody to be regulated, we want everybody to know what they're putting in their bodies when it comes to e-cigarettes and so it's time for us to step in," Torres said.

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