By Thomas M. Burton and Mike Esterl 

The Food and Drug Administration plans Thursday to impose the first federal regulations on electronic cigarettes, eventually banning sales of the popular devices to anyone under 18 and requiring makers to gain FDA approval for their products.

The rules fall short of those governing traditional cigarettes. They won't, for example, ban ads or Internet sales of the products, or the use of flavors in them, which some critics say attracts young users.

But in a victory for consumer groups, makers will be required to disclose the chemicals used in the devices and be banned from distributing free samples. New health warnings will note that the nicotine they contain can be addictive.

The battery-powered devices that turn nicotine-laced water into vapor are a fast-growing alternative to smoking, with sales expected to approach $2 billion this year, compared with the overall U.S. tobacco market of about $100 billion. The gadgets have drawn huge investor interest while sparking debate over whether they attract new users or mostly divert cigarette buyers, and whether they lure children into nicotine addiction.

The proposed rules are less restrictive, at least at the outset, than many had expected.

In a research note early Thursday, Morgan Stanley tobacco analyst David Adelman called the regulatory outline "very light, non-disruptive and unlikely to impact" the growth trajectory of the e-cigarette industry any time soon. But he added subsequent FDA actions "at some distant future point" could still curb the category.

While the initial rules appear to be good news for e-cigarette makers and their growing number of customers, or "vapers," they are likely to disappoint industry critics who view e-cigarettes as a gateway to nicotine addiction and new smokers.

"The FDA's proposal does nothing to [rein] in the wild west marketing of e-cigarettes to kids," Stanton Glantz, head of the Center for Tobacco Control Research and Education at the University of California, San Francisco, wrote early Thursday. Any forceful FDA action appears "years away," he added.

The FDA was expected to publish its proposed rules Thursday morning in the Federal Register.

E-cigarettes are taxed less than regular cigarettes and typically cost less.

Under its new rules, the FDA will require manufacturers to provide scientific evidence to substantiate any claims they make that e-cigarettes are safer than standard ones.

The FDA plans a 75-day comment period before the regulations become final. Some provisions, such as requiring evidence of health benefits, will go into effect at that point. The agency then will allow two years for all other provisions to be effective.

One of the biggest new requirements is that e-cigarette makers will need to apply to the FDA within two years to keep existing products on the market. The agency then will rule on applications roughly as it does on other tobacco products.

The rules come as some studies suggest the devices help traditional smokers kick the habit. A randomized trial of 657 people in New Zealand published last year in the medical journal Lancet found e-cigarettes were "modestly effective" in smoking cessation, with a 7.3% abstinence rate after six months.

"We have not seen anything like this in 100 years that could make the combustible cigarette obsolete," said David Abrams, a professor at Johns Hopkins School of Public Health and research director at Legacy, an anti-tobacco group. He believes the devices could wean people from traditional cigarettes.

Smoking remains the leading cause of preventable death, killing 480,000 Americans annually, government estimates show.

FDA Commissioner Margaret A. Hamburg said the regulations mark a "historic day for the FDA and for public health." She said the agency was stepping in to prevent children from smoking and suffering "a lifetime of nicotine addiction." The new rules, she said, "will make a real and enduring difference."

FDA officials stressed the new rules are just a first step and that regulations over added flavors remain a strong possibility.

But the rules fall short of what some critics have sought.

"I am concerned about e-cigarettes because manufacturers are targeting children and using promotions with celebrities, as well as using colors and flavors that are appealing to children," said Sen. Richard Blumenthal (D., Conn.)

E-cigarette makers say they don't target youth in their marketing.

Most researchers believe e-cigarettes are less harmful than regular ones, which release carbon monoxide and thousands of chemicals, including known carcinogens, through combustion.

The financial stakes are huge. Tobacco companies are plunging into e-cigarettes to try to offset sliding sales, rising taxes and widening bans on traditional smokes.

Altria Group Inc., which has roughly half of the U.S. tobacco market, began testing its MarkTen e-cigarette brand last year and earlier this year signed a deal to acquire e-cigarette upstart Green Smoke Inc. for $110 million.

Reynolds American Inc., maker of Camel cigarettes and the No. 2 tobacco player, plans to roll out its Vuse e-cigarette nationally by midyear.

Both are racing to catch up to Lorillard Inc., the maker of Newport cigarettes and the third-largest U.S. tobacco company. It has a nearly 50% e-cigarette market share in convenience stores after acquiring Blu in 2012 for $135 million.

Write to Thomas M. Burton at tom.burton@wsj.com and Mike Esterl at mike.esterl@wsj.com

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