The war on drugs in not really a war on drugs, as a war on cannabis, which is not a drug, but a herb. Which is like saying, lets have a war on air or water or that plant over there.
In my mind, a war is not really a war unless retaliation is involved, and for the past 50 years cannabis users have not violently retaliated. Rebelled, yes, but not been violent.
The war on drugs (mainly cannabis) can never be won by violence and force, it's like "trying to catch the wind".... maybe that's not a good analogy, but hey, a great song by Donovan!

But lets get serious now; not only can it not be won, it's cost the people, taxpayers, billions and billions of dollars, every year.(worldwide)
Money that could be far more wisely spent on education and creating employment.

Now that being said, why is there a war on cannabis anyway?

Harvard university professor, yes that's Harvard, the top university in the world!
Dr. Lester Grinspoon, Associate Professor Emeritus of Psychiatry at Harvard Medical School. Grinspoon was also senior psychiatrist at the Massachusetts Mental Health Center in Boston for 40 years. Dr. Grinspoon is a fellow of the American Association for the Advancement of Science and the American Psychiatric Association. He was founding editor of the The American Psychiatric Association Annual Review and the Harvard Mental Health Letter. Grinspoon was editor of the Harvard Mental Health Letter for fifteen years.

Pretty good credentials?
says that cannabis does definitely not cause Schizophrenia!
And he explains his case very clearly;
Through the data collected, Schizophrenia has always remained at a constant 1% of the population, whilst cannabis uses has skyrocketed since the 1960's.
Hence, the two have no correlation.
http://www.medicalmarijuana.com.au/medical-marijuana/medical-cannabis/the-culture-high-schizophrenia-cannabis-marijuana

second point;
after many years of research, professor David John Nutt DM FRCP FRCPsych FMedSci is a British psychiatrist and neuropsychopharmacologist specialising in the research of drugs that affect the brain and conditions such as addiction, anxiety and sleep. He was until 2009 a professor at the University of Bristol heading their Psychopharmacology Unit. Since then he has been the Edmond J Safra chair in Neuropsychopharmacology at Imperial College, London. Nutt was a member of the Committee on Safety of Medicines, and was President of the European College of Neuropsychopharmacology. His book "Drugs without the hot air" (UIT press) won the Transmission Prize for Communicating Science in 2014

Blah blah blah etc etc....Professor Nutt was employed by the British health department to analyse the dangers of illegal drugs, such as cannabis (it's a herb)
After many years of diligent study and research, he submitted his findings to the government, stating cannabis was one of the safest herbs in existence, far safer than alcohol or tobacco.
As we know now, to the contrary, it actually has medicinal benefits.

The next week, Professor Nutt was dismissed, with the explanation that his results contradicted the policies of the British government.

https://en.wikipedia.org/wiki/David_Nutt

Third point:
The Us Department of Transportation commissioned several independent studies on the danger of driving on cannabis; http://www.medicalmarijuana.com.au/images/feedgator/images/pdf/Drug_and_Alcohol_Crash_Risk.pdf
the results were negligible.

and finally the forth point and something ignorant fools have being screaming out for years.
The Gateway Theory, that cannabis is the stepping stone (excuse the pun) to dangerous drugs.
Notice I didn't say more dangerous, because cannabis is medicine, however you look at it. You can't overdose on cannabis!

A recent study conducted by the University of Victoria (Canada) and published in Drug and Alcohol Review. It further confirms what is already known to anyone willing to examine the current research: marijuana is not a gateway drug, and can actually serve as a "reverse gateway,” an agent to be utilized as treatment for alcoholism and hard/prescription drug addiction.

This study analyzed data from a national survey of Canadian pot patients. Of the 473 adults questioned, 87 percent reported using weed as a substitute for alcohol, prescriptions and illegal hard drugs. Specifically, 80 percent subbed pot for Rx medication, 52 percent for booze and 33 percent for illicit drugs. These numbers substantiate a 2009 US study of Berkeley Patients Group members that likewise found a majority of medical marijuana patients used cannabis as an alternative to unhealthy, addictive substances. 

http://www.medicalmarijuana.com.au/growing/medical-cannabis/hoorah-death-to-the-gateway-theory

So considering the above evidence, from the esteemed academia mentioned above.
Where is your argument, why is cannabis illegal, why can't responsible adults self-medicate with this wonder herb?

Now I'm not willing to debate the above, references/links are there under each point, scientific proof. But for any government official or academic who's willing, I'll do my best to organise debate with the above mention academics. Lester Grinspoon, David Nutt, etc.