Friends are advising Lindsay Lohan to get rid of her tobacco habit before going to jail, as smoking is banned in the prison where she'll serve her sentence, according to reports. The troubled actress is to surrender to authorities on July 20 to start her 90-day sentence at the Century Regional Detention Facility in Lynwood, California.

The all-female prison, where Paris hilton was confined back in 2007, has a zero tolerance no-smoking policy.

"(Lohan is) a serious chain-smoker. The first thing she does when she wakes up is light a cigarette," an unnamed friend of Lohan told TMZ.com.

"I'm honestly scared for (Lohan)... I don't think she's gone a day without smoking in years. This isn't something she can stop overnight. It's a serious condition."

Lohan was sentenced to spend 90 days in prison for violating the terms of her probation on a 2007 DUI arrest.