There used to be a small facory near tower bridge road that had a weird coffee smell that wafted every where. There was also a paint varnishy smell near there also.....is that what a popper smells like?
People call it amyl nitrate which is wrong on 2 counts.
Firstly, it's nitrite, which is a bit different to nitrate (I think nitrite has one more atom of oxygen)
Secondly, amyl is a generic term covering methyl, butyl, proyl etc. Most poppers are the butyl version.