What is the ingredient in perfume or Cologne that will trigger an asthma attack?

There is something in cologne/perfume that's not in body spray that triggers my asthma. I went out with a friend and he had on cologne and my asthma starting bothering me. Before going out my asthma hadn't bothered me in months because I stay away from things that may trigger an attack. My friend felt bad but it wasn't his fault. This often happens with other things like bleach, ajax or any bad odor.What is the ingredient in perfume or Cologne that will trigger an asthma attack?
just dont use them and ask people not to use them (strong perfumes)

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