Lindsay Lohan -- Another Vice Bites the Dust

3/14/2011 9:00 AM PDT

Lindsay Lohan -- Another Vice Bites the Dust

Lindsay Lohan has quit smoking -- a great move for her health ... whether there's a jail sentence for probation violation on her horizon ... or not (as she continues to believe).

Sources close to Lindsay tell TMZ she's continuing on the path to a healthier life by kicking her nicotine habit ... cold turkey no less. We're told Lindsay quit about a week ago and now works out with a trainer every morning.

While LiLo has been adamant about not accepting a plea bargain that includes jail time -- Lynwood Correctional Facility ... her old haunts ... is a non-smoking detention center.