On the streets in Canada he was smoking his weed, but then again... he knows what he is doing because as you can see his sign shows that he is a doctor.
His hat read, “Police Box.” The Police Box is a public callbox to call police or for members of the police department to use to contact their headquarters. They were used between the late 1890's up until the 1920's in both America and in the UK. It was also used as a miniature police office for officers to fill out reports in.
In case you are curious, Canada was the second nation in the world to legalize marijuana. It became legal under "The Cannabis Act."