DENVER – A college student eats more than the recommended dose of a marijuana-laced cookie and jumps to his death from a hotel balcony. A husband with no history of violence is accused of shooting his wife in the head, possibly after eating pot-infused candy. The two recent deaths have stoked concerns about Colorado’s recreational marijuana industry and the effects of the drug, especially since cookies, candy and other pot edibles can be exponentially more potent than a joint. “We’re seeing hallucinations, they become sick to their stomachs, they throw up, they become dizzy and very anxious,” said Al Bronstein,...