ac unit smells like cigarette smoke Help me understand the strange, almost perfume-like smell when I turn on my heater and what I should do about it : r/hvacadvice What's That Smell? AC Vent

This piece is in very good condition, no rust or pitting

So being in a confined space like an airplane or in an airport can raise stress levels if you don't have any nicotine

They include: Ammonia (deadly, corrosive, used in fertilizer) Arsenic (used in electronics, cancer-causing) Benzene (cancer-causing industrial chemical) Carbon monoxide (odorless gas that can cause death) Formaldehyde (toxic gas often used in manufacturing) Hydrogen cyanide (a fatal compound) Lead and mercury (heavy metals) Nicotine Toluene (found in crude oil and used in paint products) Uranium-238 (used in nuclear fuel) So even though this is about second hand smoke anywhere theres smoke theres nicotine, and that has its own set of dangers for your dog

& Khatib, M

This usually means your nicotine strength is too low, so youre puffing more to satisfy the craving