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@andyfallsoff
So I actually thought of this because I booked on a long ride and put a small can of coke in my bidon, then inhaled co2 when I opened the cap to drink from it - and then wondered whether a nicer gas than co2 could be included so I wasn't inhaling something that won't help performance.
Nitrous would make for an interesting ascent up a hill if the quantities could be large enough!