Harder to laugh after losing weight

I don't know if this is the best place to post this, but I am interested in seeing how others have been affected.

In the past 2 years I've lost a little under 100lbs. When I was heavier, I used to have an extremely boisterous laugh that made everyone else laugh. It found it very easy to get tickled by a joke and begin to laugh. However, now that I've lost weight I find it very hard to get tickled. I still find a lot of things humorous but I don't laugh nearly as hard as I used to. Sometimes I want to and simply can't. It just seems that I have a hard time pushing air into my stomach to laugh, I can't quite describe it well.

Has anyone else encountered the same issue or am I the only one that has this problem?