I stop smoking for 9 months then I smoke everyday for 3 months how long will it take for thc leave my system
Depends on how much THC and your own body etc. Say a month if we are leaning towards the worse/longer side.
Also drink lots of water. LOTS. But don't do it in the last few days for the drug test. Just in the meantime go nuts with water. It will clean it out, but dialutes everything else as well, and drug testing tests that. So if you flush out until the last few days you will have gotten the dialluted ratio back to normal.
And I dont know how to spell dialluted lol!