I was recently wondering this as well. I googled it and read that it stays in your system for 72 hours, no matter how often you smoke. It's usually only used in accidents to see if anyone was driving under the influence of anything.
DiLoS Reviewed by DiLoS on . how long does THC stay in your blood? have a test soon and i think it maye a blood one. I read in some places that it is as long as it stays in urine but in other places that it is much shorter. can anyone please tell me a definate answer? very worried. Rating: 5