What will happen if I breath in too much carbon dioxide

U can't breathe in carbon dioxide. and go to the chat with Bowbro in it.

A high concentration can displace oxygen in the air. If less oxygen is available to breathe, symptoms such as rapid breathing, rapid heart rate, clumsiness, emotional upsets and fatigue can result. As less oxygen becomes available, nausea and vomiting, collapse, convulsions, coma and death can occur.