Commercial Cannabis is no worse than alcohol or tobacco.
There will be rules and regulations. The business is no different than any other business, in fact I would say it is probably safe because most dispensaries I have been to have some sort of security. Kids can still play outside where they normally do.
No one who works in the industry will be running around selling to kids. Have you ever even visited a dispensary? You must show your ID at the door, sometimes before you even walk thru the door.
From my own personal experience growing up around marijuana users, and my life as an adult never once have I heard a story of a person consuming so much marijuana they kill people in a car accident. But almost daily you can read about someone drunk driving and killing people.