The use and perception of stimulants in history NOT for own entertainment

Many substances we consider harmful drugs and stimulants were seen completly difrent in the past. During WW2, not only but mostly, American soldiers were given those "pills for braveness" that were supposed to make them fearless on the battlefield. I think all the troops belived that if the pills were approved and distributed by government they weren't harmful or dangerous to health. In reality the pills were just full ampthetamine, a drug that does increase confidence,get rid of fear and sharpen up our senses but it all has a price. The drug leads many many very serious mental health problems as well as physical disfunctions. Those pills were responsible for soldiers leaving war with addictions and PTSD's. Another example is how popular and accepted cocaine was in 20th centrury.  It was used for braveness too(Ernest Schackelton explored Antarctica while on cocaine), but it was also sold in drug stores like any other medicament for headache's and tooth pains(without prescription).It was added to sweets,beverages like world famous Coca Cola( guess where the name came from) and even ciggaretes. This stimulant caused many addictions and health problems too. But many the drugs, if controlled by doctors and specialists, can help with problems they cause(a paradox, yea i know). Ampthetamine can be used to treat anxiety,ADHD and other things. Cocaine and it's solutions are used for  anaesthesia in many areas of medicine.