Cats tend to open their mouths with a frightened expression when they smell stinky feet, due to a behavior they are employing called the "split-lip olfactory response" to perceive the smell more closely. The cat's vomeronasal organ is responsible for interpreting some special smells, such as pheromones, and when the cat smells something, it will open its mouth to savor and interpret the taste. So, don't worry about whether cats are smoked by the smell, they are just perceiving and recognizing the smell in a unique way.
Cats have a very sensitive sense of smell and are able to perceive scents that are difficult for humans to detect. However, some pungent odors or toxic gases may cause adverse effects on your cat's health, such as causing discomfort such as shortness of breath, red and swollen eyes, and drooling. Therefore, we should avoid exposing cats to pungent odors for long periods of time, keep indoor air circulation, and clean the cat's living environment regularly.
If your cat is experiencing unusual behavior or health problems, please consult a veterinarian or professional pet medical institution in a timely manner. The veterinarian can conduct a comprehensive examination and diagnosis of the cat and provide the corresponding ** and care plan to ensure the health and happiness of the cat.