I'll be flying from the East Coast to the West Coast USA and I though I would post for other users the official guidelines from the TSA website on this for ease of viewing for other members.
Prohibited Items > Make sure to click on Explosives/Flammable tab
CARRY ON ONLY
Electronic Cigarettes and vaping devices
The FAA prohibits carriage in checked baggage that battery-powered E-cigarettes, vaporizers, vape pens, atomizers and electronic nicotine delivery systems only be carried in the aircraft cabin. Check with your airline for additional restrictions. Remove all electronic cigarette and vaping devices from carry-on bags if checked at the gate or planeside.
Code:
http://www.tsa.gov/travel/security-screening/prohibited-items
Prohibited Items > Make sure to click on Explosives/Flammable tab