I have allergy related asthma, not the frequent attack kind, but laughter has always been a trigger for me and led my pediatrician to suspect a kind of asthma. But I still love to laugh! And Comedy Central can leave me coughing for quite a while!
A relative has asthma. While watching Monty Python and the Holy Grail once, he laughed so hard, so the story goes, that he had an asthma attack and fainted during the Black Knight sketch. People around him were laughing so hard they didn't notice until he started moaning as he was coming around. He still tells this story.
I got it all the time so I dont notice..
I know someone with asthma who has fainted two or three times while laughing. Whenever she finds something hysterically funny, people around her yell: "Breathe!".