Bring back money to the farmers in the midwest. With the law in place, weed is still the US's #1 cash crop for farmers.
If you want a good read, "
Reefer Madness" by Eric Schlosser is great. I was against legalization before I read this book. The book is broken down into 3 parts, weed, imigrant workers, and porn laws. It's a really good book.