because you have too many dead babies in your air conditioner tank
sounds like your air conditioner compressor is bad.
sounds like your A.C. compressor clutch is locking up
there is a whole in the heater core
yes it can, often second hand smoke can make someone, and their breath if standing close enough to a person, smell like smoke to the point where you would smell like a smoker especially if you are around people who smoke fairly often
Like opium probobly