This effect is not unique to alcohol but can also occur with long-term use of drugs which have a similar mechanism of action to alcohol such as the benzodiazepines, which are sometimes prescribed as tranquillizers to people with alcohol problems.
The topic of allergies has become routine in our lives, and certainly most everyone has an idea of what an allergy is. Allergies are so common a subject in fact, it seems acceptable to discuss your allergies at a cocktail party with strangers. An allergy is an abnormal reaction by a person's immune system against a normally harmless substance.
Allergy symptoms occur when your immune system overreacts to something that is harmless to most people but triggers a reaction in anyone sensitive to it. This substance is known as an allergen. Allergies can be seasonal (worsening during certain times of the year, such as pollen allergies in the spring) or perennial (occurring year-round).