Hundreds of pot smokers hit Hyde Park and spark up spliffs to celebrate 420 Day

POT smokers spend a dazed afternoon in a cannabis haze to celebrate 420 Day.

Hundreds flocked to Hyde Park, London, and sparked up spliffs at the event dedicated to cannabis counterculture.

It is thought 420 started in California in 1971 when students met at 4.20pm each day to smoke weed.

It’s now celebrated on April 20 each year in a nod to how Americans write the date — 4/20.

Another event was held on Woodhouse Moor, in Hyde Park, Leeds.

Clouds of smoke rose above large groups as they smoked joints during the gathering.

Loud music blared from a sound system.

One reveller could be seen grilling meat on a barbecue to feed hungry potheads.

A number of stalls were set up selling smoking paraphernalia like bongs.