Not really. I don't claim that there may not be other living organisms in our universe, however, they probably aren't made the way people tend to think of when they use the term: "aliens." I won't go scientific (was never much of a scientist) but according to many of the reports I've read on this subject (has this Chinese encyclopedia with a section about alien sightings), other living organisms in the universe would most likely be single-celled organisms that do not have complex bodies and are invisible to the naked eye. Personally I think that the so-called "aliens" that abduct people are probably just bizarre abductions committed by humans.
However, I don't object to aliens existing and I wouldn't mind anyone calling me wrong. I just simply really can't bring myself to believe in extraterrestrial beings. It doesn't particularly seem to me that "aliens" want to do anything with me, so the matter itself doesn't really concern me.
EDIT: P.S. Can we add an "I don't care" option? Or an "It's possible but I'm not certain" or "I doubt it but not certain" option?