By drawing it into your mouth first and holding for a second or so you will absorb more of the nicotine, then if you draw directly to the lungs, its known that you absorb the most from your mouth, throat, and nose. Mucus membranes. The vapor molecules are bigger than in smoke molecules and the lungs have a harder time taking them in and get them to the blood stream and to the brain. Exhaling out of the nose will also help you realize flavor better.