[m0llusk]

Yes, but in the worst way. Giving large amounts of CO2 to plants is kind of like giving huge doses of steroids to athletes. They grow abnormally and become unhealthy and short lived.

[JudasGoat]

My cannabis plants flower with 15 to 20% yield improvement and no abnormalities at 1500ppm CO2. Edit One of the side effects of CO2 infusion ironically, is tolerance of higher temperatures.

[m0llusk]

This is not about your cannabis yields. In high concentrations CO2 is a pollutant: https://yaleclimateconnections.org/2020/12/more-co2-in-the-a...