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!
My wife's family has mild asthma. They like to make each other laugh - sometimes for fun, sometimes for cruelty. Every once in a while as kids they were sent to their rooms because everyone was getting completely cracked up to the point of breathing problems. At my wedding, one of these escalations resulted in my mother in law cracking a rib. Once it was known, it was absolutely forbidden to laugh around her. It got to the point where people would look at her and break sponteneously into howling laughter as they ran from the room as quickly as possible. The reception was, ummm, hilarious! Fortunately only close familiy and friends showed up, since it was 32 below zero and all of the roads around Calgary were closed. The next day we woke up in Florida. What a week!
I used to have laughter-trigged asthma, but no more. I take one 10mg singular tablet per day, along with two doses of Serevent Discus (I prefer the inhalant, but alas, Glaxo discontinued it in order to (in their words) "save the ozone layer." These are wonder drugs, in my opinion.