Go to a dentist or try an actual tooth whitening product [not toothpaste, a product marketed solely to whitening] (though I find these to be dubious).
Guarantee no natural remedy is going to work. They MAY (and say that with great skepticism) help people who weren't smokers, but it is absolutely not going to make a difference in your case.
Pretty much any dentist you consult on this matter is going to tell you that you need professional whitening, and it's not just to get your business. Go find one online who doesn't get paid to answer your question and doesn't live anywhere near you and could hope you'd get their business, they will tell you the same thing, guaranteed.
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