In case Marijuana becomes legal within the next 10 years, most of the drug cartels around the world will lose their main source of income. 
Also, the national parks within the United States will no longer be cut down to plant hemp by the Mexican drug cartels. Also, the state and federal governments will benefit a lot, in terms of tax money.
Also, the national parks within the United States will no longer be cut down to plant hemp by the Mexican drug cartels. Also, the state and federal governments will benefit a lot, in terms of tax money.