Pain relief is a whole different thing from staying stoned.
Who was talking about being stoned all day?
I never used cannabis till 2015. When I start I weighed 289 lbs and was taking as prescribed 6 different psyche meds for severe mental illnesses. I was unemployable for over 10 years as a consequence of my illnesses.
I started using cannabis in Feb 2015 & discovered, much to my surprise THC successfully treated all my symptoms by many orders of magnitude better than the Pharma meds.
In 3.5 years using cannabis I lost 116 lbs & immediately went back to work. I still use cannabis daily & have three jobs that I am thrilled to have after being unable to function well enough to work. I am living proof you can be under the influence of cannabis & still function at a high level. Like anything else, it depends on why you use it & how much do you use.