i only smoked weed once...ever...how long will it stay with me... PLEASE HELP i only smoked weed once about a week ago, and i have a drug test in about a month. I have a urine and hair test. i have heard of tests detecting use for up to 90 days for hair tests. will i be ok or not. is there anything i can do to get rid of traces of the weed and pass the test.