ALBANY, N.Y. (AP) — Citing a rising number of calls to poison control centers relating to liquid nicotine, U.S. Sen. Charles Schumer on Sunday called on the federal government to require child-proof caps on containers used to refill e-cigarettes.

Poison control centers in New York have received nearly 70 calls so far this year regarding accidental poisonings from the liquid. That’s compared to 46 calls in all of 2013, Schumer said.

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