THIS IS AN URBAN MYTH: "RJ Reynolds has recently Trademarked several Marijuana Strain names (Trainwreck,OG Kush etc.)."

There is no category in the US Patent & Trademark office for substances recognized by the federal government as unlawful. A search for all the above marks in the US Trademark registry shows numerous existing trademarks using these names for t-shirts, underwear, toiletries, electronic publishing, etc. Each item listed in their proper category. But, again there is no category in the Trademark registry for cannabis.

You could trademark a strain of tobacco you wanted to call 'Trainwreck'. You could do the same for a watermelon, or a tomato. They are open and available under their specific trademark categories. But, you can't trademark a strain of cannabis under any name.