Poison control centers around the country have seen a sharp increase in calls about young children’s exposure to e-cigarettes. The biggest threat appears to be ingestion of liquid nicotine, HealthDay reports. Young children exposed to e-cigarettes appear to suffer worse health effects than those exposed to regular cigarettes, the researchers report in the journal Pediatrics. The number of e-cigarette exposures in children younger than 6 years old increased 1,500 percent between 2012 and 2015. During that period, poison control centers in the United States received more than 29,000 calls related to e-cigarette, nicotine and tobacco product exposures among children under 6. E-cigarettes accounted for 14 percent of those calls, while traditional cigarettes accounted for about 60 percent of exposures, and other tobacco products accounted for 16 percent of calls. Children under age 2 accounted for almost all cigarette and other tobacco exposures, and 44 percent of e-cigarette exposures. In April 2015,...