Daily use of such substances is abuse, pure and simple. If you can't function without your morning coffee, then your body has adjusted to the presence of caffeine and you are abusing the substance. Doesn't matter if everyone does it or not, medically speaking.

Personally I don't drink coffee unless I'm interviewing someone at a coffee shop (even then I sometimes order hot chocolate), and only drink socially. Does that mean I work less than some adderall-infused college kid? Maybe. But quality of life and stability should also be valid concerns.