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Was Marlboro first to use ammonia to boost nicotine?

They called it "the secret of Marlboro."

R.J. Reynolds was desperate in the mid-1970s to learn why its leading brand, Winston, was losing market share to Philip Morris' Marlboro. So were other tobacco companies that were losing out in a ruthlessly competitive business."We couldn't figure out what the success of Marlboro was," said David Bernick, an attorney for Brown & Williamson. "We couldn't figure out why it was that Marlboro was taking off in sales."

The reason, as it turned out, was ammonia, a chemical that boosted Marlboro's nicotine "kick" and improved the taste at the same time, according to documents and testimony emerging from Minnesota's lawsuit against the tobacco industry.

"The secret of Marlboro is ammonia," according to a 1989 Brown & Williamson document. "Ammonia does many good things."

Two expert witnesses for the state told the jury in detail how tobacco companies use various ammonia compounds to alter the chemistry of cigarette smoke to give smokers a stronger nicotine dose.

The way ammonia works, they said, is that it makes the smoke less acidic. That changes a portion of its nicotine into "free nicotine," a form that is more readily absorbed in the lungs. Free nicotine's effects are felt in the brain within seconds.

The experts - a Mayo Clinic authority on nicotine addiction and a Stanford University chemical engineering professor - said boosting free nicotine also ensured that cigarettes would remain addictive even though the companies were bringing out low-tar, low-nicotine brands.

"What the industry was concerned with, in the face of lowering tar, is the problem they would face if nicotine levels dropped" below the level needed to keep smokers hooked, testified Channing Robertson of Stanford. "They didn't want to go out of business."

Marlboro was the first major brand to really capitalize on ammonia, jurors learned.

Documents showed that Reynolds, maker of the competing Winston brand, began experimenting with the chemical in the 1950s but didn't incorporate it into its products until the mid-1970s.

Reynolds' scientists learned that Philip Morris had begun using an ammoniated form of tobacco in 1965 and used more and more of it from 1965 to 1974. "This time period corresponds to the dramatic sales increase Philip Morris made from 1965 to 1974," one document said.

A 1973 Reynolds report shown to jurors said Marlboro's and Winston's overall tar and nicotine levels had dropped by two-thirds over the years, but Marlboro's free-nicotine level stayed about the same while Winston's free nicotine fell by two-thirds.

The report advocated copying Marlboro's approach.