London, UK. 1st August, 2015. Campaigners inhale balloons inflated with nitrous oxide, commonly known as “laughing gas” to get high during a protest in Westminster's Parliament Square against a proposed bill that
Protesters inhale laughing gas right outside Parliament - BBC News
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Nightclubs selling laughing gas warned they face prosecution for offering potentially lethal substance - Mirror Online
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Reminder: Don't Buy Or Sell Nitrous Oxide After The Show, Brah - Gothamist
Hippy crack: What is nitrous oxide and how dangerous is the laughing gas? - Mirror Online
