Now that she is a mom, Katherine Heigl has given up smoking and she explains how she did it in a new interview in Parade:
"Now I use an electronic cigarette. I know it's ridiculous, but it's helping me not to actually smoke real cigarettes. You feel like you are smoking, and you get to exhale but it's just water vapor and not nicotine. I've been doing it for six months. Smoking sucks! The one thing I would say to my kid is, 'It's not just that it's bad for you. Do you want to spend the rest of your life fighting a stupid addiction to a stupid thing that doesn't even really give you a good buzz?'"
Last week Heigl showed David Letterman how she smokes her electronic cigarette (video below). She said it's the only thing that works and she has tried the patch, the gum and the prescription drug Chantix.
"I'm essentially humidifying the space," she said as she puffed away.
But electronic cigarettes contain liquid nicotine, and CBS News reports they may be harmful as they are poorly regulated and deliver "just a little bit" of vaporized nicotine.
WATCH Heigl on Letterman: