A new rule by the U.S. Food and Drug Administration that bans the sale of e-cigarettes to anyone under 18 will go into effect Aug. 8. In most cities and states, however, selling e-cigs to anyone under 18 is already prohibited. In some cases, restrictions apply to those under 19 or 21. On May 4, California Gov. Jerry Brown signed a bill that prohibits the sale, and purchase, of tobacco products and electronic devices that deliver nicotine to anyone under 21. The law makes California the second state, after Hawaii, to change its smoking age to 21.