Aldermen complained about an earlier version of the ordinance that would have only prohibited people from smoking e cigarettes loaded with nicotine cartridges in public places, arguing it would be nearly impossible for business owners to tell whether a patron had nicotine in an e cigarette. The version the full council will take up Wednesday makes no distinction between e cigarettes loaded with products that contain nicotine and those without.

Several aldermen continued to express concerns about the indoor ban Monday, arguing there is no clear scientific consensus that the vapor emitted from electronic cigarettes is dangerous like smoke from tobacco products.

“It is a ban, because you re making people go outside, you re treating it just as you would an analogue cigarette or tobacco cigarette,” said Ald. Rey Colon, 35th. “You re lumping it together in the same category even though you don t really have any proof that it has any harm. You re saying We re going to regulate first and ask questions later. “

But with several Emanuel administration officials looking on and the mayor s lobbyists pulling aside aldermen for private chats before the vote, the measure passed 15 5.

The ordinance also requires that e cigarettes be sold behind the counter. Dr. Bechara Choucair, commissioner of the Chicago Department of Public Health, said that s meant to make it harder for minors to take up electronic cigarettes. The cartridges that can be loaded into the e cigarettes can be bought in candy like flavors that critics say are enjoyable for kids who then get hooked on conventional smokes.

The General Assembly passed a measure last year that sets a statewide ban on the sale of e cigarettes to minors and requires retailers to check the age of anyone trying to buy an e cigarette who appears to be younger than 27.

Ald. Brendan Reilly, 42nd, suggested the City Council adopt the part of the city e cigarettes ordinance that regulates sales while putting off a vote on the portion dealing with indoor smoking in public places until more scientific consensus has been reached on the health impact.

“I m certainly not here to defend Big Tobacco. They re done enough harm in this country,” said Reilly, who smokes. “But I do have friends and family members who are using (e cigarettes) to quit, to get away from combustible tobacco that kills people.”

But the measure seemed destined to pass when Emanuel threw strong public support behind the e cigarette regulations in recent weeks, saying they go along with recently adopted restrictions on selling menthol cigarettes near Chicago schools in protecting the city s children from early addiction.

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9 terribly disturbing things about electronic cigarettes

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By now, you’ve probably seen them being smoked on the subway or in a bar those shiny, futuristic, battery operated nicotine inhalers better know as electronic cigarettes that are apparently all the rage these days. Big Tobacco companies have taken notice, too, and are determined to cash in on the industry, which is expected to bring in $1.7 billion in U.S. sales this year alone, according to The New York Times.

While much is still unknown about the health risks of e cigarettes, here s what we do know E cigarettes are addicting. And while they may not be as harmful as tobacco cigarettes, critics like the British Medical Association and the World Health Organisation are wary of the trend and warn of the dangers that may be associated with the smoking devices.

Here’s what we do know about e cigarettes

1. E cigarettes contain toxic chemicals.

A 2009 FDA analysis of e cigarettes from two leading brands found that the samples contained carcinogens and other hazardous chemicals, including diethylene glycol, which is found in antifreeze. Last year, a report from Greek researchers found that using e cigarettes increased breathing difficulty in both smokers and non smokers, according to Medical News Today. A more recent study funded by a smoking cessation advocacy group concluded that

“There is no evidence that vaping produces inhalable exposures to contaminants of the aerosol that would warrant health concerns by the standards that are used to ensure safety of workplaces. However, the aerosol generated during vaping as a whole (contaminants plus declared ingredients), if it were an emission from industrial process, creates personal exposures that would justify surveillance of health among exposed persons.”

2. Kids and teens can buy them.

Unlike other tobacco products, e cigarettes can be sold to minors in many places throughout the country. The smoking devices can also be bought legally online, according to the Wall Street Journal.

3. While cigarette companies say they don’t market to kids, e cigarettes come in flavors like cherry, strawberry, vanilla and cookies and cream milkshake.

4. Laws regulating cigarette ads don’t yet apply to e cigarettes.

TV commercials for cigarettes may be banned, but ones for e cigarettes sure aren’t, Adage points out. (The above ad for Blu eCigs features Jenny McCarthy.)

5. And e cigarette companies are spending a TON on advertising.

Industry advertising spending increased to $20.8 million in 2012 from just $2.7 million in 2010, according to The New York Times.

6. E cigarettes can be used in many places where smoking is banned.

Even though some studies suggest that secondhand vapor poses health risks, many lawmakers have yet to determine whether smoking rules apply to e cigarettes, according to USA Today.

7. People think e cigarettes can help them quit smoking.

Research published in the American Journal of Public Health indicates that 53 percent of young adults in the U.S. who have heard of e cigarettes believe they are healthier than traditional cigarettes and 45 percent believe they could help them quit smoking though there is little evidence to support either of these claims.

8. E cigarettes aren’t taxed like traditional tobacco products.

Even though cigarette consumption fell significantly as taxes went up.

9. Despite unknown health consequences, e cigarettes are poised to make inroads with a new generation of young people.

Half of young adults say they would try e cigarettes if a friend offered them one, according a study cited by USA Today.

This post has been updated with additional information from recent studies on the subject.

Also on HuffPost

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• 1. Smoking related health conditions are a leading cause of death in the United States, accounting for nearly one of every five deaths annually. Source The Centers For Disease Control

• 2. Every year, tobacco use kills more Americans than HIV, drug and alcohol abuse, suicides, murders and car accidents combined. Source The Centers For Disease Control

• 3. Secondhand smoke accounts for approximately 50,000 deaths in the United States every year. Source The American Lung Association

• 4. Cigarette smoke emits nearly 8 billion kilograms of greenhouse gases annually. Source

• 5. Tobacco farming also contributes to deforestation, destroying more than 500,000 acres of forest a year. Source

• 6. If tobacco farmers around the globe were to grow food instead, they could feed more than 70 percent of the world’s 28 million malnourished people. Source

• 7. In 2012, cigarette companies spent nearly $27 million lobbying government agencies and members of Congress. Source

• 8. Big Tobacco companies market covertly to teens, despite publicly stating that youth should not smoke. Source U.S. News & World Report

• 9. Each year, the industry spends more than $400 per customer on special promotions, coupons, mailers and other direct marketing efforts to make sure current smokers don’t kick their addictions. Source Stanford University

• 10. Now, companies are pushing expensive and unregulated e cigarettes. A “starter kit” which includes an e cigarette device, batteries, nicotine cartridges and other accessories can cost upwards of $100. Source

• 11. What’s more, e cigarettes are offered in a variety of flavors that young children and teens could find especially appealing, like cherry, grape, vanilla and strawberry. Source Fox 5 News

• 12. The health effects of e cigarettes are still unknown. Medical associations and regulatory bodies are concerned that e cigarettes are nothing more than a “gateway” to a nicotine addiction. Source The Huffington Post