I assure you I am neither JC or an idiot. You stated that CO2 is not poisonous to humans, without clarifying with 'at normal atmospheric concentration'. Perhaps, to prevent your continuing to be a subject of ridicule, you shouldn't post sweeping, inaccurate, generalisations.
A helpful link for you, ( and anybody else who might be interested ); https://www.kane.co.uk/knowledge-centre/what-are-safe-levels-of-co-and-co2-in-rooms