San Francisco supervisors voted unanimously Tuesday to boost the legal age to buy tobacco products from 18 to 21, despite arguments from opponents that cities and counties cannot trump California law.
San Francisco joins Boston, New York City and Hawaii in raising the minimum age to buy cigarettes and other tobacco products.
"This is a big win in the fight against the leading cause of preventable deaths in our country," Supervisor Scott Wiener said in a statement.
The issue has gained traction nationally as lawmakers try to discourage young people from starting to smoke, especially popular e-cigarettes. A report last year by the Institute of Medicine found that 90 percent of daily smokers first tried a cigarette before 19.
Opponents argued that California law sets a minimum age of 18 and that provision prohibits municipalities from setting a higher limit.
Thomas Briant, executive director of the National Association of Tobacco Outlets, has urged San Francisco to hold off on voting until the state attorney general can issue a decision. He said 18-year-olds are adults when it comes to voting, serving in the military or signing a contract — and smoking should be no different.
Attorney General Kamala Harris has no legal opinion pending, a spokeswoman said.
San Francisco's city attorney called the proposed ordinance legally sound. It goes into effect June 1.