Marijuana is very harmful and most certainly more so than tobacco and alcohol. Alcohol can be used in moderation. Marijuana is an illicit way that people “get high” and have hallucinogenic and delirium producing experiences.
That said, I do support this drug being used for Medical purposes only. I personally feel that the appetite inducing effects of THC are very beneficial for the end state cancer patient.
I personally am a strong advocate of the medical uses of this drug, but it must be at the hands of a trained physician.
I do believe that everything in creation has its purpose and that Hashem has given us this drug for a reason.
But that said, I disagree that it has a recreational use.
Also consider that there are many reports that Marijuana use has been linked to brain disorders such as schizophrenia.