JOE KLAMAR/AFP/Getty Images
Bin Zhou of Kimree shows electronic cigarettes at the Kimree booth during the 2014 International CES at the Las Vegas Convention Center on January 8, 2014 in Las Vegas, Nevada. CES, the world's largest annual consumer technology trade show, runs through January 10 and is expected to feature 3,200 exhibitors showing off their latest products and services to about 150,000 attendees.
If you've been out and about lately you may have noticed the not so new trend of e-cigarettes.
You'll see people with hand held vaporizers, some with blue tip, some look like futuristic pipes, and some look just like cigarettes, but instead of smoke they emit an almost odorless vapor.
It's a fast growing industry worth more than $1.5 billion, and as of right now it's largely unregulated. But that might change soon. For more on that, we're joined by Megan McArdle who wrote about this for Bloomberg Businessweek.