Health officials said there's been a spike in the number of nicotine poisoning caused by electronic cigarettes.
A report released by the CDC Thursday said the poisoning reports rose from one per month in 2010 to over 200 this year.
Experts said nicotine in its concentrated liquid form is very toxic, even in small doses.
Poisonings occur after it's inhaled, ingested or absorbed through the skin.
Officials said that more than half of the reports were for children 5 years old and under.