Nitrous oxide, as sold on the street, is hardly dangerous at all, so why [ so much effort to get rid of it ]( http://www.theguardian.com/society/2014/aug/13/brick-lane-is-the-uks-laughing-gas-megastore-but-for-how-long ) ? Perhaps it is unsightly, like a hungry homeless person. Cities try to ban them, too.
Ссылка: https://stallman.org/archives/2014-may-aug.html#14_August_2014_%28Nitrous_oxide%29