This is one of the most EXTREME methods we've ever heard for trying to QUIT SMOKING.  But if it works for this woman, it could start quite a trend.

31-year-old Etta Lopez of Sacramento, California wanted to quit smoking.  So she decided the best strategy would be . . . getting herself THROWN IN JAIL.

 On Wednesday, Etta followed through with her plan, and SLAPPED A POLICE OFFICER.

 She told the cop she wanted to go to jail, where she'd be FORCED to go without cigarettes.

 And part one of the plan worked . . . she was arrested and now she's in jail.  As for whether part two of the plan worked . . . we'll have to see if this really does get her to stop smoking.

 (CBS 13 - Sacramento