Tonic Oxygen Bar, Boulder

Instead of being a typical oxygen dive bar full of regulars playing air hockey and listening to Yanni on the jukebox, this hip little spot exudes a very stylish swank. Overstuffed chairs and couches make for relaxing perches to wedge a tube in your nostril and inhale a variety of scented air selections. There is also a small bar which serves herbal elixirs and bottled water. An indoor fountain and relaxing New Age music adds to the room's calming feel.