This is likely one of the single most ignorant arguments that one could possibly participate in.Your average weed enthusiast doesn't see (and isn't going to be convinced by any means you might possibly employ so simply do not bother as it is a complete and utter waste of your time and theirs) that their recreational drug use is harming themselves or anyone else. They believe what they believe and no amount of logic, reason, cajoling, arguing, demanding, or other means is going to persuade them that their viewpoint is flawed in any shape, fashion, or form.
On the flipside of the same coin the people that are so deadset against it for any reason whatsoever are not going to be convinced that there is any positive use for it no matter the circumstance.
It's an old argument wherein neither side is going to be able to convincingly change the other side's mind about it so each faction continues going round and round in circles completely convinced that the other side simply has it all wrong and if they would just bother to listen!!!! (Sound familiar guys and gals?!?)
Those of you that like weed then more power to you.
Those of you that do not then it's an easy answer! Don't use!
Quit wasting so much time and energy on a fruitless battle, folks.
It's silly....