Well id like to say its worked for me. Ive had 9 plants, 4 on oneside, and 5 on the other. One side gets misting, and o e side doesnt. Higher co2 ALLOWS you to have higher temps, and everything else. Co2 is what plants use, so how could spraying plants not work? Leaves consume co2 within a one inch range all around the leaves.When the water evaporates, or is soaked up, the co2 goes where? It doesnt magically disappear away from the plants. Plants absorb nuitrients througn the leaves through foiler sprays, why cant co2 sprays work too? It may not be some super 1 pound cola production, but you cant tell me it doesnt do any good at all. Not if leaves breath in co2. Because the half that doesnt get it in my garden, arent near as filled out as the ones that do get it. Once again, i am not saying its a primo way to get super weight. Its not, but it does help. I spray mine 3 times a day.