Why do people assume that pot smokers go to work and work while "high". I don't make the assumption that alcohol drinkers drink before, during, and after work. Most drinkers use their off time to have a drink. Guess what? Most pot smokers wait until their off time to smoke.
This tired old notion that the work force will suddenly turn into a bunch of error prone stoners is getting played out. Guess what the reality is? If you go to work drunk you will probably get fired, and if you go to work high you will also probably get fired.