There are myriad ways to celebrate National Queso Day (Sept. 20), whether you use this culinary delicacy as a dip, a dollop or a full-on smothering agent. Thanks to one Colorado cannabis company, locals will be able to enjoy queso in a new way – by smoking it. Denver-based company O.pen recently teamed up with local Tex-Mex chain Illegal Pete’s to create a marijuana vape pen inspired by the restaurant’s signature side.