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Initially when I noticed them for the 1st time a few years back I thought that might be something to do with getting high.
You might be right, but I ussually see them on the road as some one stoped and mended on the spot. Not a forensinc but seem they were dropped from a low height as they are not widely scattered(too much explanation).
I would guess if it were kids fooling around they would be a bit more secluded I guess. Also encounterd them on lanes too.
Finding empty CO2 cartriges droped on the roads. Ussualy 2/3 together.
If you carried them full up to there pretty sure won't be such a great hussle to drop it in a bin or home for recycling if worried its going to screw your times!