Use canned air, not compressed air
I don't know of any manufacturer that makes any such product that consists of air. Almost always these are fluorocarbons, since propellant gases are easy to relatively easy to compress into a liquid form. All such products have adulterants added by law, in order to deter kids from inhaling them.
If what you are saying is people shouldn't use air from air pumps (like the kind you use to inflate tires or spray pictures on your motorbike) then I agree, this air usually contains water vapor and traces of whatever lubricant is used for the air pump.
David
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