I would think that an addiction is an addiction no matter how you look at it or what you are addicted to.
You would have to draw the line at how if it is bad for you or bad for others. Bad for you is personal, it doesn't necessarily invade the rights of others, bad for others would be when your addiction causes you to invade or hurt others.
So, a coffee addiction I think would be less harmful than a drug, pot, or drinking addiction, cause it mostly just affects you (though you might get a bit crazy and do something stupid), whereas the danger of being high or stoned or full of alcohol is that you lose control of your senses and you are not able to respond quickly, as in the case of driving.
I hope noone gets offended by this, but to me an addiction to anything is a sign of weakness, that you can't control your own impuleses and bodily urges. I don't think you have to be "addicted" to anything, and if you find you have an addiction or dependency on something, perhaps you need to reason it out and discover the cause and see if you can adjust your life so that the addiction no longer has control and is just a pleasurable pasttime.
Of course, Mark Twain said
Too much of anything is not good, but too much whisky is just enough.
(I love the guy!)
> So what's the difference between being
> addicted to coffee as opposed to being
> addicted to marijuana?