A nebulizer is a machine that creates a fine, drug-infused mist that can be breathed into the lungs. Although a nebulizer may be easier to use than an inhaler, especially if you are breathing rapidly and can't coordinate your breathing with an inhaler, it won't help the average person with asthma any more than an inhaler will. That's because the droplets of drugs sprayed from an inhaler are even tinier than those from a nebulizer. The smaller the particles, the more likely they can travel through smaller and smaller air tubes to the farthest reaches of the lungs.