i used to smoke about once a month when i was on probation. the closest i ever cut it was 1 toke and 13 days later i passed a test without drinking water or anything but i was totally clean before that. my last month i smoked like 3 different times in the first 2 weeks and ended up passing after 17 days clean. hope this helps, if you dont smoke more than 3 hits at a time any more than every week you can stay relatively close to the trigger line to pass the test