What is when in doubt always follow your nose?

"When in doubt, always follow your nose" is an idiomatic expression that encourages one to trust their instincts when uncertain or unsure about a situation. The phrase originated because the sense of smell is closely linked to memory and often alerts us to danger or something that doesn't seem right. Therefore, if you are doubtful about a situation, it is better to trust your instincts and follow your nose, rather than blindly relying on the information available. It implies that one should rely on their intuition or gut feeling for decision-making in uncertain situations.