One needs to ask the question
"What do you get out of marijuana that makes you want to use it?" Surely things like it slows reaction time, makes you drowsy, encourages weight gain, causes shortness of breath, can be responsible for mental health problems or unsociable behavior are not things as role models we want to promote to our children.
So what is it that you get out of using pot?
Are you trying to expand your mind or become enlightened in some way? Did all the great spiritual leaders use or promote pot? Bob Marley may have but he was not a spiritual leader although his songs did promote unity and love which can only be a good thing.
I think that those are questions that people need to ask of themselves
-- assuming they feel the need to do so. Secondarily, I suppose it's worth asking other people, if you do so in a spirit of sincere inquiry rather than as a method to create a soapbox to articulate your views. Unfortunately, this thread has primarily consisted of people asking/demanding/shouting the questions at others, or about others, and then shouting out their own answers. That's not the way to come to understanding.
If you genuinely want to know why other people do something, then ask them -- in an open-ended manner, such as, "Why do you do that?", not "Do you think that's going to make you enlightened or something?" with the strong implication that if you do think so, you're a dummy. Then listen
to the answer. If you don't want to do that, soapbox away, but don't kid yourself about what you're doing.