Generally 75% alcohol does not harm the body, often sniffing alcohol can be inhaled into the lungs or esophagus, but the alcohol can also be volatilized, so the esophagus, respiratory tract, and even mucous membranes will not cause damage. Concentration of alcohol, such as 95% alcohol can be volatilized after inhalation, but due to the concentration is too high, the respiratory tract and even the esophagus can cause discomfort. Such as long-term sniffing 95% alcohol may cause some damage to the eyes, nasal cavity, oral mucosa. Often smell the lower concentration of alcohol generally will not have an effect, the concentration is too high on the pharynx or mucous membrane of the mouth and nose may cause some damage or discomfort. If you work or live in an environment with a high concentration of alcohol for a long period of time, it is recommended that you regularly ventilate your home and improve your environment to minimize the damage.