[cdavis]

Well, some of these guys may be a bit rabid, but it really is not a good idea. Having tried several different scenarios while driving, I can say from experience (yeah, the Darwin guys would love me) that it can be different from normal apnea in ways that will sneak up on you and can get you killed. For example, it is extremely easy to go into hypocapnic blackout. One or two good deep breaths, followed by a full lung hold, and I am well on my way to blacking out. No fun to be driving along and lose all vision at about 6 seconds into the hold. Nothing you can do about it for a few seconds, either. Not sure why this is, but its not a good thing to explore.

Connor