No.... 'The Sinaloa cartel can buy a kilo of cocaine in the highlands of Colombia or Peru for around $2,000, then watch it accrue value as it makes its way to market. In Mexico, that kilo fetches more than $10,000. Jump the border to the United States, and it could sell wholesale for $30,000. Break it down into grams to distribute retail, and that same kilo sells for upward of $100,000 — more than its weight in gold.…
The marijuana market is twice the size in US Dollars vs. the cocaine market and nearly half the volume of the overall drug trafficking. http://www.talkingdrugs.org/report-global-illegal-drug-trade...
Edit: Some googling produces estimates ranging from 30 to 70 percent imports, depending on the point the article is trying to make, so let's just call it 50% domestic nationwide.