U.S. President Barack Obama sits after addressing the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri

British Foreign Secretary Boris Johnson speaks at a meeting of the United Nations Security Council to address the situation in the Middle East during the General Assembly for the 71st session of the U.N. General Assembly at U.N. headquarters in New York, U.S., September 21, 2016. REUTERS/Lucas Jackson

A man uses an electronic cigarette on a sunny spring day in London, April; 14, 2015. REUTERS/Cathal MacNaughton

A person holds an electronic MarkTen cigarette as seen in this photo illustration shot in Washington March 17, 2015. REUTERS/Gary Cameron

People gather along the shore of the Mediterranean Sea during a search for victims after a migrant boat capsized, in Al-Beheira, Egypt, September 21, 2016. REUTERS/Stringer

Irish Minister for Public Expenditure Paschal Donohoe speaks during an interview with Reuters at the Ministry of Finance in Dublin, Ireland September 22, 2016. REUTERS/Clodagh Kilcoyne

Irish Minister for Public Expenditure Paschal Donohoe poses for a picture after an interview with Reuters at the Ministry of Finance in Dublin, Ireland September 22, 2016. REUTERS/Clodagh Kilcoyne

Irish Minister for Public Expenditure Paschal Donohoe speaks during an interview with Reuters at the Ministry of Finance in Dublin, Ireland September 22, 2016. REUTERS/Clodagh Kilcoyne