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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.
bujalarab-
It's probably cyclists ditching them once the light CO2 is used up and the cartridge fills up with that heavy air to save those precious, precious micrograms
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People do do nos whilst driving and sitting as a passenger. Or park up somewhere, do a bunch, dump the box of now empty capsules out of their door and then drive off.
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If you do want to do the forensics, CO2 cartridges are steel and usually threaded. NO2 are aluminium, and therefore lighter and non magnetic, also not usually threaded. I think.
Me I use Helium.
ltc
ric_a5
chez_jay
Isn't it more a getting high thing these days?
whippits or whatever the kids are calling it now