John Mayer accepts the Grammy for Best Male Pop Vocal Performance for his record Say at the 51st annual Grammy Awards in Los Angeles, February 8, 2009. [Agencies]?

John Mayer has stopped smoking marijuana.

The 'Gravity' singer - famed for his wild and womanising ways - no longer indulges in the drug and joked he hires someone to replicate users' perceived benefits of the substance.

He wrote on his Twitter account: "Any time I feel like smoking pot I just book myself a life insurance exam.

"I don't smoke pot anymore. I just pay a dude 50 bucks to come over, press lightly on my chest and tell me all my ideas are awesome."

Mayer is not the only celebrity to recently voice his concerns over marijuana.

Last week, Britney Spears stormed off stage during a concert in Canada because the stage was too smoky.

Shocked concertgoers were told the show would not continue if people continued to smoke cigarettes and marijuana in the arena as it was "unsafe" for Britney and her performers.

After Britney returned to the stage, the 27-year-old singer told the audience: "Thanks Vancouver. You were wonderful. Drive safe. Don't smoke weed!"