How long is weed stay in you system in you haven't smoked in a month?

When you smoke weed, it stays in your system for about 4 hours depending on how much you have smoked in that day. If you are counting it by how many days, it stays in your urinary system for about a week and then it will be untraceable and it stays in your blood system for about 5 months. If you know that you have a UA coming up, and it hasn't been a week, then the best way to pass that is to mix some urine with water....if there is no sink in the room.......well the next way to get by that is the toilet. Good luck!