You get to choose what kind of treatment you will accept from the people you allow to be part of your life. IMO, Lying is unacceptable behavior. I don't accept it from my kids or my friends or my acquaintances. I especially wouldn't accept it from my spouse. I don't care if he acts relatively normal when is high or not. That's not really the point, is it?
Do you know what personal boundaries are? Do you have any when it comes to lying? Or abusing drugs? Or making illegal purchases?