"I think that the kids may see it, 'Ok, since it's legalized, it's not going to hurt us,' which is not true," Lawson said.
Officer Lawson said marijuana smoke contains 50 to 70 percent more cancer-causing chemicals than tobacco smoke.
"The most dangerous, no question, is marijuana," Lawson said. "I think that's what people are not seeing right now."
Marijuana can also damage the upper respiratory system, lead to short-term memory loss and affect depth perception.