Aeroshot Pure Energy is a slim, pocket-sized tube that works like an asthma inhaler. Pull on the little button gently, and the tube opens up at one end, allowing you to inhale a puff of light, caffeinated powder that dissolves instantly in your mouth. Each puff contains 100 milligrams of caffeine, roughly equivalent to a tall mocha at Starbucks, and each tube has 6-8 shots inside. Unlike a Starbucks mocha, it’s calorie-free, and it won’t give you horrid coffee breath. AeroShot will be available in Boston and New York in January, for a price of about $2.50 per tube.