I bought this cup & saucer for my wife but she can't use it because the words peel off in heat.
(thelemmy.club)
The words are also on the inside of the cup.
That's a classic ADHD response to caffeine. Generally people with ADHD will still get the jitters and increased heart rate, but they will not get the energy-boosting effect, and sometimes even get sleepy. It being a stimulant, it can also have a (slight) benefit to your ability to focus.