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The 18 year old, who is shown giggling and babbling incoherently in the film, is said to have been smoking controversial but legal psychoactive plant Salvia, and experts are already stepping forward to condemn Cyrus' actions.

Former California State Assemblyman, Anthony Adams, who attempted to have the substance banned in the state back in 2007, is adamant the young star is setting a bad example.

He tells TMZ.com, "You do incredibly crazy things (under the influence of Salvia). Miley is a star and young kids are going to emulate her behaviour. It's time for state and federal governments to renew their push toward an outright ban (of this substance)."

A spokesperson for America's Drug Enforcement Administration adds, "Salvia is a drug of concern. We are taking steps to look further into it..."