Well it's not smoke, it's water vapor. Dew appears in the morning because the cool air contracts and water vapor in the air gets close enough to form droplets. By the same token, pressurizing air brings the water vapor close enough to form condensation momentarily. All smoke is is ash & small particles light enough to float on air. Your lungs are coated with a wet surfactant to allow the easy passage of gas. Any smoke (tiny particles) in your lungs is going to stick to the wet lining and solubilize immediately. It's the insoluble particles in smoke, like the cyclic hydrocarbons created by burning tobacco, that are the bad actors. Since cyclic hydrocarbons are stable and insoluble, they tend to remain in your lung tissue. Macrophages (white blood cells) try to eat them unsuccessfully. It is thought that because there are always so many neutrophils (white blood cells) in the lungs of smokers trying to eat away those tough cyclic hydrocarbons, some of the neutrophils breakdown and mutate, becoming cancerous. Same sort of thing occurs with coal miners (coal containing cyclic hydrocarbons). You should never inhale tobacco smoke into your lungs, or expose kids to second hand tobacco smoke. It drives lung cancer rates way up. If you do inhale, the smoke will only last in your lungs transitorily. It's what soaks into the tissues of your lungs and hangs around that gets you.
