Here in Stockholm it is common to see spent 1.3kg N2O bottles just lying on the sidewalk in the morning, especially after a weekend.

And I doubt that is much dentistry going on on a weekend night on the streets of Stockholm.

The companies selling the N20 bottles even advertise on Youtube.

I just had a look at the cost of a 1.3kg bottle of N2O, it is less than the equivalent of 50USD.

And now I see that they have flavoured N2O…