If marijuana taxation were implemented nationally, do you think current estimates $132 billion are too low?

If marijuana taxation were implemented, do you think current estimates $132 billion are too low? Using data from states that currently have sales where possible. By my own calculation of the industry in 2012 being 16bn in nys where its still not legal. Based on the assumption that all of america smokes just like ny thatd put my estimate as $261.651bn in 2010 so . . .