Indeed canabis causes several harm to the mental health when abused. Many youth seem consume this hard drugs which has resulted in distorted perceptions hence funny behavior.

This things need thorough and serious regulation in some countries to prevent the abuse of these drug. In some foreign countries, the government are doing really well in paying to this things so the society does not turn into a menace.

I don't think this things can be eradicated has they have certain health benefits also. It's just control that is needed in this matter.