I don't know why as society we are so adamant on censoring things or distorting reality to avoid hurting children the way we think is going to hurt them by expo

I don't know why as society we are so adamant on censoring things or distorting reality to avoid hurting children the way we think is going to hurt them by exposure to marijuana etc but has somebody done the research that shows marijuana smoke hurts kids? Nothing pisses me more off than seeing a parent light up a fucking cigarette in front of their kids. But marijuana? God forbid any kid with epilepsy or depression smoke the devil's drug and end up like reefer madness...