what I mean with this question is, what is the possilbe limit you can smoke without the THC remaining ins system. is it possible to smoke a bowl and pass a test 24 hours later. Will one hit even register. if you do not smoke more than a few hits does the THC have time to build up in the system? is it guranteed no matter how much you smoke, 1 hit or ten it will show up? i've always wondered this. can smelling weed, or touching it if its covered in thc cause you to fail from thc going up nostrils or seaping into pores!! what does it take for it to build up and show up and how low is a 50 ng level? 1 hit? what?