A funny video showing three grandmother’s smoking marijuana for the first time has driven the internet potty.

The clip, which has gone viral, was recorded in Washington State, in the US, where the recreational use of the drug has been legalised.

The three grans share a bong as an observer watches how the react to different challenges, including playing jenga and card games.

After just 5 minutes, the trio are noticeably more relaxed and giggly.