The main reason I don't do any of those things is because they are a complete waste of time, money, and are harmful, in more ways than one; basically, the obvious reasons.
"Straight Edge" is just a loose label for the actions I choose to take, or not to take, as the case maybe. I don't follow anyone else's philosophy, and I actually agree with that comic, and the points he made. It became a scene that people wanted to get into, something to be a part of, and some made hypocrites out of themselves. So, when I say I'm "straight edge," I merely mean that I adhere to the policy of no poison (drugs/smoking/alcohol), or promiscuous sex for reasons that have nothing to do with the origins of the term.