Y'know, this is one of those questions that keeps coming up on a regular basis, often with different answers. In this particular article, relying on a video from the Smithsonian, the answer is "You'd suffocate to unconsciousness in less than a minute because the air would escape from your hemorrhaged lungs (due to vacuum); also, major bloating would probably incapacitate you with pain."
So bear that in mind for the next SF book (or comic book movie) you write …
Boil, Burn Or Explode? How You Die In Space
You’ve seen it in the movies: Somebody gets caught in space without a spacesuit and explodes. Or freezes. Or gets fried by radiation. But which is it? Astrophysicist Adam Frank weighs in.
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All I know is I read somewhere to exhale right away.
+Scott Randel I would think that would help — but I'm not sure you could exhale enough to reduce the pressure issues for the pulmonary system. (Of course, there are other openings in the human body that would also likely create problems, too.)