Originally Posted by
kiwi chick
I have to add to this - don't try to hide it:
a) because they will find out and you'll look bad, and
b) the ruling is there for a reason and if you DO have "real" asthma you are only putting yourself and the rest of the crew at risk!
Or am I naieve?!

Kiwi, naive, no, simply repeating what Selection said.
As for your second point, this is a very real risk. A minor problem on the ground is always magnified in the air; in one sense that is why large passenger aircraft carry two pilots. It is also why they have two engines too.
Craig, how would you, as a passenger, feel flying with a fully serviceable engine and one that was known to be a bit dodgy?