I appreciate your opinion (and I know I probably am a bit of a contrarian on this subject).
However, my personal observation is that marijuana removes a person's drive and ambition--somehow, their personalities change--they become numb and indifferent to life. Subtle changes, but I've seen this in so many it's becoming easy to recognize...
And (despite the publicity) I've also seen quite a few move on to harder drugs (i.e., yes, it's a "gateway" drug).
Again, my opinion (and my observations). YMMV of course, but I believe marijuana is one of the worst things to ever happen to society.
Pharmacology is not the answer...