Essay about Legalization of Marijuana

I would like for you to write a research paper about the Legalization of Marijuana. I already told my proffesor that I am in favor, so I have to stick to that. He wants me to use a couple of counter arguments throughout the essay.

After you state the thesis and justify it in the first paragraph, then comes the counterargument with its paragraph, and then another paragraph defending my thesis again with another counterargument and so on.

The length is minimum 1500 words and I should turn it in tomorrow before 12:00 pm. Thank you in advance.