Hmm, tea isn't strong enough for me. Perhaps I could replace coffee with methamphetamine, if it comes down to it. Sticking with coffee — for now.
They also have controlled release mechanisms and are available in therapeutic doses.
It is not the same thing as buying however much you want of a significantly stronger stimulant and taking and instant hit.
And to anyone not prescribed those medications that are obtaining them for recreational usage, you make an already difficult life of ADHDers much worse, as some are denied an effective, life-changing treatment because of this.
Because it's certainly far easier to get in pure form on the black market compared to other amphetamines.
However, tea leaves are safe for consumption, so you could eat them instead (for example as a salad).