[cluckindan]

The previous poster habitually drinks coffee, and thus already has tolerance to the stimulant effects / increased neurotransmission.

[kstrauser]

I’m not buying that. An enormous percentage of the US population drinks coffee. I’m not an unusual case study here.

[fn-mote]

Not all of the stimulants work the same way. When (if?) you build up a tolerance to one, you change to a different med. I expect the same applies to the caffeine -> adderall change.

[cluckindan]

Coffee is not just caffeine. It contains biologically relevant amounts of monoamine oxidase inhibitors.