Smoking, drinking, drinking coffee, and often eating spicy and stimulating foods such as onions, garlic, and leeks, or hobbies of stinky foods such as stinky tofu and rotten eggs, are prone to bad breath. Smoking, drinking, drinking coffee, and often eating spicy and stimulating foods such as onions, garlic, and leeks, or hobbies of stinky foods such as stinky tofu and rotten eggs, are prone to bad breath.