The most ignored ingredient in cigarettes:

Fiberglass insulation is what insulates most attics and keeps them warm in the winter and cool in the summer. It's made by grouping millions of tiny glass fibers, which are tiny rods of glass nearly too small to see individually, like glass wool. There is a reason why cigarette filters (butts) take up to fifteen years to disintegrate. They are made of glass wool, and that is why a smoker's fingers and/or thumb stay cool, even when they smoke the cigarette right down to the nub/filter. When these tiny "shards of glass" escape into the mouth, throat, esophagus and lungs, they rip apart the epithelial tissue, the soft tissue lining the inside of those parts of the body. This creates damage not only on the surface but on the cellular level. Then the chemicals creep into the wounds, and that leads to cancer. When viewing X-rays of people exposed to asbestos or fiberglass, and even smokers lungs, ground glass opacity (glass fibers sitting in lungs) looks as if someone breathed in glass fibers and a pile of them are just sitting at the bottom of the lungs, like ground glass in a busted light bulb.

Yet the most obvious cause of health problems including cancer constantly blamed on "tobacco." In fact people are so deluded they think the filter is protecting them. If cigarettes were only allowed to be sold with "tobacco and paper" lung cancer rates would undoubtedly plummet.