Allergic reactions

I would like to know if the body is capable of emitting a substance which causes others to sneeze, cough, get a runny nose, etc. For years, I have had this effect on people. At the minimum their nose will itch and at its worse they sneeze or cough repeatedly. This has persisted despite changing soaps, shampoos, laundry detergents, tooth pastes, etc... I am in good health otherwise. What would cause others to have reactions as mentioned and would it be something exhaled or sweated out? I have no pets and have lived in many different places with no relief.

[cursedtoo]

Exposure??? This has been going on for over 25 yrs!!! It occurs when i'm out of town and has followed me to the 10 different residences i've had over the yrs. I know most soaps, detergents , etc use the same ingredients and eventhough i've used many different brands in my quest to end this nothing has worked. Most people who use these products don't have this problem of causing others (on a daily basis) to sneeze/cough. What about me would make these common products cause this??? If it is exposure to something uncommon, what would that be?