the way you are judging people is rather cold and close minded it seems... What you described above didn't make much sense even though one might be able to assume what you were insinuating.
If you are entirely ignorant to the experience of cannabis then of course it is going to be difficult to grasp tolerance levels and you might not be aware of the body of scientific knowledge available today supporting the use of cannabis as a medicine to various ailments (it's a long list), there are millions of cannabis patients using it as medicine in multiple countries. Doctors around the world look at and use it as medicine and have for many years, I don't know what your point is? Is it that you wouldn't want a doctor to smoke a joint and then do an operation? Okay, but you wouldn't want him to drink a few beers and do an operation either would you? Does that mean beers are always bad? You also wouldn't want a doctor to do an operation if he was very tired and had been working too excessively and was drastically in need of sleep and physically exhausted, you also wouldn't want a doctor operating on you who was stressed and rushing without taking extra care, what is your point? ... it is possible for someone to work their job.. go home and relax and use cannabis.
RE: NJ Sees Booming First Month in Business For Marijuana