Mostly the combustion products & Tar associated with tobacco smoke that causes yellowing.
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They are nicotine stains.
The biggest cause of LCD yellowing is the use of improper cleaners on the screen.
Nicotine. Consider not smoking because you will probably die in a very sad way and lose the life that was probably full of depression anyway because no one wanted to kiss you because you had smoker teeth.
Cigarettes don't really cause cavities if you have healthy teeth, but they can certainly speed up the process of getting one because the nicotine is absorbed in your mouth through the smoke while you are inhaling, whether or not you "direct inhale". Proof: The yellow and brown nicotine stains that are dominant in people who have smoked for a long time, and personal experience.
No.
the major cause of newspaper yellowing is leftover processing acids in the pulp used to make the paper, not light.
Yes, it is recommend
The nicotine in it.
No, nicotine in the patch will cause you to test positive for nicotene... that's about it
By definition, if it requires nicotine it is not natural.
addicts you to it.