Shouldn't there be millions of reports of all those bright red corpses resulting from cyanide poisoning? > At lower doses, loss of consciousness may be preceded by general weakness, dizziness, headaches, vertigo, confusion, and perceived difficulty in breathing. At the first stages of unconsciousness, breathing is often sufficient or even rapid, although the state of the person progresses towards a deep coma, sometimes accompanied by pulmonary edema, and finally cardiac arrest. **A cherry red skin color** that darkens may be present as the result of increased venous hemoglobin oxygen saturation.