This is what I was thinking, since there is probably a strong genetic component to an individual’s dopamine production and response profile. As someone who lived most of my life with undiagnosed ADHD and just recently started taking stimulants for treatment, I can attest that normal life issues which once seemed like arduous mountains to climb are now summarily dispatched before lunchtime when I have a dopamine boost. It’s shocking how effective the medication is, side effects notwithstanding.