It looks like Kylie Jenner has picked up a new habit!

The 18-year-old recently posted a Snapchat video of herself puffing on an e-cigarette and blowing smoke rings like a pro, hinting that it isn't the first time she's done it.

RELATED: Kylie Jenner's Family is Worried About Her Out of Control Behavior

While some fans are concerned that she's smoking weed, the devices are more popularly used as an alternative to actual cigarettes and are filled with flavored e-liquids that can contain nicotine.

Of course, the Keeping Up With the Kardashians star is no stranger to controversy – and most of it stems from her Snapchat.

Click through the gallery to see her raciest SC pics.