What about the law and nitrous oxide?
At the moment nitrous oxide is not illegal. It falls under the Commodities Act, so the use, possession, sale and sale of laughing gas are not punishable. In the past, nitrous oxide fell under the Medicines Act, so the sale of nitrous oxide for improper use was prohibited. Now that is no longer the case and the seller of laughing gas only has to ensure that the product he or she sells is safe. Work is currently underway on a ban on nitrous oxide from 2021.
Mayors can however ban the use and sale in certain parts of town through a APV (general local measure).