The byproduct of smoking a lot in a vehicle. The smoke discolors
the windows and effectively adds a layer of "tint" to the glass. This layer grows over time due to smokers not washing their vehicle. While effective in reducing harmful UV rays, the benefit is reduced by loss in resale value of the vehicle. Nicotint is also a sometimes unwanted deterrent to the
opposite sex. Levels of
second hand nicotine exposure are unknown at this time.