NSW and Victorian laws prohibit the sale of nitrous oxide to a person a person suspects will inhale it. But with 24/7 nang delivery providers re-rising in Sydney and Melbourne this year, some professionals say additional need to be done to circumvent too much use. * Observe: Shipping and delivery https://www.google.com/maps/d/viewer?mid=16nvwK5z9rFDsCqhowYx7OEA522vSlo0