E-cigarette users will have to take it outside under a new law taking effect in the city today.
The measure passed by the City Council last year places e-cigarettes under the Smoke Free Air Act, which bans traditional cigarettes in restaurants, bars, private office buildings, and public places like beaches and parks.
Supporters of the new law say it will prevent e-cigarettes from making smoking socially acceptable again, especially among teenagers.
But critics say the ban will hurt tobacco smokers who are trying to kick the habit.
"Now one that wants to stop smoking and use vaping products have to go out and sit with the smokers and be around exactly what they are trying to get away from," said Henley Vaporium CEO Peter Denholtz.
A similar ban on e-cigarettes is also taking effect today in Chicago.