Joan Rivers smokes cannabis on reality show

London -  Comedienne Joan Rivers shocked TV viewers on Tuesday by smoking marijuana on her reality show.

The 78-year-old funnywoman was shown getting medicinal cannabis from a dispensary in California before puffing it from a pipe while sitting in her car with a pal.

As the effect of the drug takes hold, she then dissolves into fits of giggles and has to be driven home by a friend stopping on the way to pick up burgers and fries, the Daily Express reported.

But Rivers’ pot-puffing antics infuriated her daughter Melissa, who told viewers that now she had to yell at her mother for acting like a teenage kid.

“My 78-year-old mother has now become 17, and I have become a soccer mum yelling at her teenage kid,” she said.