I'll see all the negative arguments and raise them one Willie Nelson.

Seriously though, humans have been using weed heavily for millennia. It has been used for clothing and rope. A mates parents had a hemp blanket they made during WWII to keep warm in occupied France, they also consumed it for nutrition in the same period. It is called "weed" for a reason. Easy to grow and infinitely useful.

His dad also used to make opium tea for his aches and pains in season.