as long as you had your disclaimer posted on the door to your buisness, or front page of your website, then you should be covered. there are many hookah bars for tabacco smoking in the states, and there are many who practice native american traditions which use herbal mixtures. if that is not prevelant in your comunity, then you can claim to be ahead of your competion in the resurgence of these trends.
Three hundred thousand dollars??? Jeez Sounds as though you should be OK though - you DO have a disclaimer, right?
I don't know if the court is going to believe that, if they see you posted it on a marijuana forum. I'm not trying to be a dick, but I have seen peoples situations made worse by shit they put on the internet, myspace and forums especially. Be careful dude, and good luck.