marijuana has been used for thousands of years in society, but some people choose to use it wrong and abuse it for things it isnt meant for, and now here we are with tons of drug wars all over south america and people dying and ruining their lives with pot (not from the medical side effects, but the social and mental ones)
seriously if everyone could use it for what its helpful for and not to just "get high" or "have a good time" then we wouldnt be having so many problems
also fun fact: the us constitution was written on paper made with marijuana