NEW YORK — Mayor Michael Bloomberg signed landmark legislation Tuesday banning the sale of tobacco products to anyone under the age of 21, making New York the first large city or state in the country to prohibit sales to young adults.
During a brief ceremony at City Hall, Bloomberg said raising the legal purchase age from 18 to 21 will help prevent young people from experimenting with tobacco at the age when they are most likely to become addicted. City health officials say 80 percent of smokers start before age 21.
The mayor, a former smoker, also signed companion legislation setting a minimum price for all cigarettes sold in the city: $10.50 per pack. The same new law bans retailers from offering coupons, two-for-one specials, or discounts.
In signing the bills, Bloomberg turned away criticism from some retailers that the measures would be economically harmful and lead to job losses.
‘‘This is an issue of whether we are going to kill people,’’ Bloomberg said. People who raise the economic argument, he said, ‘‘really ought to look in the mirror and be ashamed.’’
Teenagers can still possess tobacco legally.