Yup. Discovered me and my dad have ADHD at pretty much the same time. In our case (very stimulant sensitive) we had to quit coffee to use ADHD meds. While I eventually switched to Inka (a roasted grain coffee substitute) when I saw how my heart results get better without coffee, he still struggles. He recently quit meds for some time due to unwanted symptoms and told me how he was away with some friends and deeply relished being able to normally drink coffee again.