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I agree with the previous poster.  You can't be "allergic" to a smell.  That being said, people definitely react to smells.  Airborne particles can act as irritants, can trigger an asthma attack and can make you feel generally uncomfortable.  There is one other important factor to keep in mind though.  The brain can also play a role in a response.  For example, if a person knows they are allergic to peanuts and they smell peanuts it can cause the person to be very anxious.  These symptoms can be confused with an allergic response.  This does not mean that it is "all in the head", the person is experiencing real symptoms.  It is not however an "allergic" response.