Experts warn there could be unexpected health risks from eating foods containing the drug cannabis. Those risks include accidental overdose, children eating them accidentally and unexpected effects in older adults. The commentary by doctors Lawrence Loh and Jasleen K. Grewaland appeared in the Canadian Medical Association Journal. Loh is with the Dalla Lana School of Public Health at the University of Toronto. He said, “What we really want the public to know is that legal doesn’t mean safe. People need to know that how they react will depend on the manner cannabis is consumed, the amount that is consumed and the person’s own metabolism.” Loh said it can take hours for the cannabis high to take effect if the drug is eaten instead of smoked. So, he said, people might eat more of the cannabis as they wait for the high to happen. While a cannabis overdose will not kill you, it can be unpleasant, Loh said.