What you do is called unscheduling. It is a method of time boxing where you define your me time as the highest priority thus creating a sense of urgency and rew

What you do is called unscheduling. It is a method of time boxing where you define your me time as the highest priority thus creating a sense of urgency and reward for your work time. You could as well decide to go for a run at a certain time instead of smoking pot. Pot is just easier because you will shut down automatically thus releaving you of the duty to care for your mental hygiene through other means.