Interspersed with all this pedantry is a smarmy judgement towards stimulants and COMPLETE LACK of context of the times, and a lack of any societal or species context that recognizes the BREATHTAKING ACHIEVEMENTS during said times of "Oh so bad bad we should be ashamed it's an epidemic!" There's an undercurrent here that is almost criminal.
The sin is not excess, certainly at 5mg a dose. The sin is not 'euphoria', which often turns out to be psych-speak for 'a simple will to live'. What people crave with caffeine and amphetamine is mental alertness. Caffeine delivers, speed delivers more. And with that people can do, have done, incredible things.
Aside from the specific physiological effects like chronically overbearing hearts that also plagues athletes, the worst mental effects of stimulants are often blamed directly on the drug -- not abusers' lack of discipline -- and result from a LACK OF or DISRUPTION OF sleep. Stimulants do NOT, in themselves, make you crazy.