People who are generally more honest expect nothing less than honesty from others. We get burned again and again because we give people the benefit of the doubt. The naivete of youth wears off... we get more jaded. Depending on how well you know and trust someone, and based on experience, it gets easier to spot a liar.
People who lie frequently worry about it, and that makes them paranoid of others. They may even lie to you to protect them selves from harm, believing that you intended to decieve them. People who lie a lot feel that they are gaining something from it, what ever that may be. There must be a motive. They are motivated to lie, just as others are motivated to tell the truth by their empathy and morals, both derived from emotional intelligence.
People generally assume that others are similar to them selves when trying to discern truth through logic, because that is the only comparative factor they have. That's why it's so hard for an honest person to understand a malicious liar, and so hard for a malicious liar to understand an honest person. We have different intentions.
I sympathise, but I don't think your poll is very fair!
Everyone tells "white" lies now and then - or, a lot. In fact, studies have shown that an average person tells a lot of white lies without thinking to much about it, simply to make smoother social interaction (ie less explanations, to avoid getting in trouble when late for work, or to avoid hurting someone's feelings) A poll of 5000 women in Britain says that %96 resort to little white lies on a regular basis for this reason. That's almost everyone.
I guess when you think someone might be lying to you, it's better to try to find their self-serving motive. Unles of course, they are lying selflessly in the belief that it somehow benefits you. If there is no motive to be found, they're probably telling you the truth. Besides, you could just openly ask them if they are and judge their reaction. It's better than brooding suspiciously.