Lindsay Lohan in Jail: No Cigarettes = Big Problem!

Lindsay Lohan's close friends are concerned about her going to jail.

Not on moral grounds or anything like that. They're just worried the train wreck won't survive a day without the one thing she can't live without ... cigarettes.

Lohan is likely to do time at the same all-female facility where Paris Hilton was locked up in '07, and the place has a serious zero tolerance no-smoking policy.

Bad news for Lindsay.

She's a "serious chain-smoker," blowing through at least two packs a day. "The first thing she does when she wakes up is light a cigarette," a friend says.

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SMOKED: Lindsay Lohan must surrender July 20 to begin her 90-day jail sentence. Maybe she can draft up a legal manifesto to score some cigarettes in the slammer?

The source adds, "I'm honestly scared for [Lindsay] ... 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."

We'd feel bad, except had she not displayed the worst possible attitude, acting like a spoiled brat who is somehow above the law, while flat-out ignoring very reasonable probation terms, she'd be free to smoke all day on the outside.

Just saying. It's her fault.

The upside is that if she goes to the Lynwood facility July 20, as expected, it could actually lead to her kicking the habit, if she's willing to put in the effort.

Don't hold your breath.