Per the British Medical Journal, we're playing with fire, folks: http://www.bmj.com/content/347/bmj.f7274
Yeah well apparently you can get emphysema from taking a shit, based on that article too.
I have asthma and it's not a big deal. Just gotta be smart about how you play.
Plus one.oh for fuck's sake... typical medical community 'research' shit... if it happened once, ever, in recorded history,within 20 yards of a person laughing, put it on the list. How fucking absurd.
I'm sure somebody laughed once and accidentally kicked somebody in the balls, so they need to add testicular rupture to the list.