Yeah well if you can walk out into a field and scoop up some dried leaves or flowers and smoke them, I'd say it's a plant leaf too.
Even tobacco needs more processing than pot leaves I think. And it's so very much more deadly and addictive

Fucking cigarettes are the devil.
ps: yeah it's a plant leaf that gets you high. Thats not a "drug". Maybe people would be better off not doing it, just like about a billion other things people COULD do and some choose to. Others dont.