Why can't people understand that weed is not as harmful as cigarettes and alcohol?

The reason why weed is safe is only because all the chemicals in it(67 I think) is not harmful to your body, it just kills brain cells which is a myth. If you are weed you would have to cook it in with sum brownies because the THC chemical Ned heat in order to get high. The government doesn't want people saying anything about drugs on tv only how people get caught with drugs.