People who take drugs, take them to feel good, or better about themselves. There are many things that people do to achieve the same effect. I know, that when i am on a little break from smoking trees, and i have a shitty day, i lift weights to feel good. On a day where i am scheduled to lift, i think about it a lot. At an Alcoholic's Anonymous meeting, that is described as a serious mental addiction, or a phenomena of craving. They say that alcoholics get drunk off the first drink, cause once u pop the fun CAN'T stop. Once i get lifting, nothing will pry me from that bench in that ratty corner of my basement. If that isn't a drug, i don't know what is.
I guess the argument could be made, that with exercising, you are not ingesting anything. OK, but i have a friend who eats his feelings. For those of you who do not know what i mean; when he has a shitty day, he goes home and just eats and eats and eats. Not only is he doing or ingesting something to feel good, but he is causing bodily harm, could food be considered a controlled substance?
Asprin and advil and other various household or prescription drugs are used to ease pain and do away with a sickness. Marijuana and friends are used to ease the pain of life, and are used to do away with sadness.
Almost anything can be considered a drug if you view the essence of it, in a poetic sense, the motive and the desired outcome. All technicalities aside, i get high on grass, get drunk at the gym, and shoot up by getting my girlfriend to take my pants off, while still coming down off that buzz I get from watching that funny John Stewart on "The Daily Show".
I guess we are all "drug addicts" in some way, just some more descriminated against.