I used to smoke pot, decades ago. The stuff they have now is gazillions of times more potent.
Pot smokers have a high rate of crazyness.
They can be absolutely just as dangerous as drunks while driving, for instance.
The idea that it is harmless or benign is not only stupid, it’s dangerous.
I haven't researched this subject as pot is still illegal in my state. But my wife is a surgical PA and sees information about this (along with a lot of other miscellaneous medical information). She tells me there is a very high rate of psychosis and dementia among long term pot smokers. She got this information from medical journals circulated among physicians, PAs, etc.
Colorado might discover issues they hadn't planned on. Then again, they might just discover that pot is the benevolent drug that many Freepers want us to believe it is. Time will tell.