i had to pass one a couple years ago, i didnt smoke before i took it, and about an hour before hand i brushed the hell out of my teeth, sides of my cheeks, roof of mouth, and tongue, etc, chewed gum, and i was in the clear. i'm not sure if it's bullshit, but i heard that chewing ice breakers gum also makes it undetectable {?}. good luck :hippy: