LOS ANGELES - Lindsay Lohan is the latest star to tumble from Hollywood's heights into the tumult of substance abuse, continuing a sad tradition of young celebrities who deal with mounting or fleeting fame by turning to drugs and alcohol.

The actress, 21, was arrested Tuesday in Santa Monica and released on bail for investigation of misdemeanor driving under the influence and with a suspended license and felony cocaine possession.

Police initially said she was also being booked for investigation of transporting a narcotic, but Lt. Ray Cooper said late Tuesday she was not.

Police received a 911 call from the mother of Lohan's former personal assistant, saying that Lohan was chasing her in an SUV, officials said.

Lohan, who completed a more than six-week stint in rehab earlier this month and previously had checked into a recovery clinic in January, still faces DUI allegations connected to a Memorial Day weekend hit-and-run crash in Beverly Hills.

Her attorney, Blair Berk, said Lohan had relapsed and was again receiving medical care at an undisclosed location. Lohan's publicist, Leslie Sloane Zelnik, had no comment.

With two trips to rehab behind her and a litany of legal problems in front of her, Lohan joins a long list of young talents who've faced high-profile battles with drugs: River Phoenix, Drew Barrymore, Corey Feldman, Anissa Jones, Danny Bonaduce, Macaulay Culkin. Some have gone on to enjoy healthy careers. Others died before reaching adulthood.

Part of the problem is that society has become "radically more permissive," said longtime publicist Michael Levine.

"We're living in this very crazy culture in which it seems like if you act up, it actually makes you more famous and more successful," he said. "Hollywood is like society-at-large on steroids."

At the same time, the average age at which kids — famous or not — start using drugs has dropped every decade since the 1960s. Today's youngsters start experimenting with drugs about age 12, said Dr. David Deitch, an addiction specialist for more than 40 years and clinical director of Phoenix House, a national nonprofit provider of substance-abuse treatments.

"The earlier the age of onset of chronic drug-taking, the greater the prognosis is for long-term problems," he said.

People who start using drugs at young ages fail to develop "multiple social, intellectual and behavioral competencies," he said, which can often lead to further drug use and addiction.

The glitter and glamor of Hollywood only exacerbate the problem, he said: "That life is all about the excitement, drama and peak performance followed by a letdown that gets medicated with entertainment and medication."

Phoenix, who starred in "Stand By Me" as a teen, died outside a Hollywood nightclub in 1993 from a lethal combination of cocaine and heroin. He was 23. Feldman, his "Stand By Me" co-star, also battled addiction and was arrested for heroin possession when he was 19.

Jones, who played Buffy on TV's "Family Affair," was just 18 when she died of a drug overdose in 1976. Bonaduce found fame at 10 as a star of "The Partridge Family," only to struggle with addiction and homelessness as a teenager. Culkin, best known for his starring turn in the kid-friendly "Home Alone" films, was busted in his early 20s for possession of pot and Xanax.

Barrymore has fared best. After going to rehab for drugs and alcohol at 13, she is a sought-after actress and filmmaker with her own production company, Flower Films.

The 32-year-old Barrymore weighed in on Lohan and her hard-partying contemporaries — Paris Hilton, Nicole Richie and Britney Spears — in an interview with Harper's Bazaar earlier this year.

"You just have to try to be as graceful as you can," Barrymore told the magazine. "You know, you flub, you flub. And that's life ... I think, do what you want, but just be professional."

Lohan's latest legal troubles may cost her movie roles. She was set to start shooting "Poor Things," a comedy featuring Shirley MacLaine, when she entered rehab in May. At the time, producers said they were "trying to rearrange the shooting schedule" to accommodate Lohan. On Tuesday, producers said that their "sole focus is moving this film into production." They would not say whether Lohan would be part of the production.

A producer lambasted Lohan last summer for repeatedly arriving late to the set of "Georgia Rule," which came out in May.

"We are well aware that your ongoing all-night heavy partying is the real reason for your so-called `exhaustion,'" producer James G. Robinson wrote in a letter to the actress.

Lohan is still set to appear in the film "Dare to Love Me," which is to begin shooting this summer, said Michael Sands, a consultant for production company Bowline Entertainment.

"The producers have compassion and kindness for her, so for now she's insured and still with the movie," he said. "She hasn't been convicted of any crimes."

All Hollywood productions need insurance, and troublesome or troubled actors can often stand in the way of that requirement.

"I don't see how she's employable for the next 18 months," Levine said. "Who's going to insure her?"

Lohan's latest film, "I Know Who Killed Me," is set to open Friday.