I know e-sabbath asked this question 5/01
http://boards.straightdope.com/sdmb/showthread.php?threadid=68501&highlight=stacker
But the thread was taken up by discussions of Asthma & e-sabbath’s experiences (It worked for her/him). Anybody have any cites on whether they work?
I understand the danger side (and if as a PSA you want to state that cool) but I’m really asking is are they effective? …