Katherine Heigl & David Letterman Smokestik It Up

Katherine Heigl has tried to quit smoking using the patch, the gum, and prescription drugs — but none of it has worked.

Until now!

The 31-year-old former Grey’s Anatomy actress revealed on yesterday’s The Late Show with David Letterman that she now uses the electronic cigarette Smokestik, which gives off a water vapor instead of smoke. (It still has nicotine in it.)

Watch the segment below!

10+ pictures inside of Katherine Heigl out and about the Big Apple…