No. IMO, it is NOT worth the effort/risk.

If you want to add CO2, do it through the air. Do it the right way. Sealed up room, decently high temps, no exhaust. I think spraying it does just what you said, adds very little CO2 (probably some, but not much) and does risk burning your plants (trust me on that one...)

TGF
TheGreenFog Reviewed by TheGreenFog on . Seriously - Discussion On Spraying CO2, Any Point? . Seems to me the amounts of CO2 transported to the plants from spraying seltzer water would probably be quite small and sporadic. And do the leaves absorb CO2 in that manner? Another problem is that preferably when applying CO2 you want maximum lights going and even quite high heat, risking burns. Is it worth the effort?' . Rating: 5