LOS ANGELES — California lawmakers have taken the first step toward accomplishing something Major League Baseball could never do: Stop players from stuffing those big wads of chewing tobacco into their mouths during games.

With Gov. Jerry Brown signing a bill earlier this week banning the use of smokeless tobacco in all California ballparks, a practice dating to the days of Babe Ruth and Ty Cobb now seems headed toward the sport’s endangered species list.

Although California is only one state, it is home to five of Major League Baseball’s 30 teams, and team owners themselves have been pressing for a ban for years. Last May they got one in San Francisco, home of the reigning World Series champion Giants. In August they got another in Boston, site of fabled Fenway Park, and when Brown signed Assembly Bill 768 on Sunday one was already in the works for Los Angeles.

“Major League Baseball has long supported a ban of smokeless tobacco at the Major League level and the Los Angeles Dodgers fully support the Los Angeles City Tobacco ordinance and Campaign for Tobacco-Free Kids,” the Dodgers said in a statement last month.