I think every post in this thread is missing one important factor, so I'd like to share a story that will clear the issue up:

Here's what I think...someone who isn't me once had a lot of plants and decided to make edibles, since she knew the buds would be a good quality. She made a batch of cookies with 1g in each cookie. She routinely smokes large amounts every day, so she started off with two cookies (2 grams). After 2 hours, she was feeling a little bit, but was slightly dissatisfied, so she ate 2 more. After she ate them, she felt nothing for the rest of the day, and her mild buzz went away quickly after she ate them. She tried this again a few days later, this time eating 4 cookies to begin with, and again she felt nothing.

She decided to give it one more try, this time with a bowl of schwag to help move it along. Except this time, she titrated her dosage. She took 5 cookies, and had one small bite every 5-10 minutes, for as long as it takes, or until the 5 cookies were done. After an hour and a half, she was 1 and a third cookies in, and she decided to hit her bowl. After smoking, she was very intoxicated and realized how hard it hit her.

The point of the story is that her mindset has a large impact on the experience. First, she thinks she ate too much the first few times so that her high quickly turned to anxiety, which in return quickly ended her high. Next, the third time she ate them, she was relaxed, ready, and intent on feeling high from the cookies. And finally, if you tell yourself that you're not high, then you won't get high. Instead, focus on other things--the people around you or your environment--and when the edibles start to kick in, you won't need to question it, because it will distract you from whatever else your mind was doing at the moment. It happens so slowly that if you focus on it and wait for it to happen, you'll be disappointed.