Nitrous oxide was dubbed ³hippy crack² because of how cheap it is and its popularity at festival-like events.
Music-lovers also wore next-to-nothing as they enjoyed the last of the heatwave ahead of the first performances on the main stages.
Hot festival babes
Yesterday, temperatures climbed to 35C as Britain sweltered in the hottest June day recorded in 40 years.
Revellers were seen wearing bikinis and skimpy shorts while having massive water fights as they tried to cool off.
Emergency services even issued a warning to campers, telling them to be prepared for excessive heat.
estival fans queue as the gates open at the Glastonbury Festival amid heightened security
“Long queues are expected at the festival entrance as extra security checks are put in place.”
But there are fears rain could hit the festival tomorrow, with previous years blighted by mass flooding after torrential downpours.
Last year, heavy rain turned the site into a mud bath, with large camping areas left totally unusable.