Researchers may have finally found the most effective treatment to stop smoking. They're using tailor-made treatments to find out how smokers digest the nicotine inside their bodies.

Their findings reveal that matching a treatment based on how smokers metabolize their nicotine can be an effective clinical strategy to help smokers choose a cessation method that will work for them, according to co-author of the study, Caryn Lerman, a professor of psychiatry from the University of Pennsylvania.

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Researchers say a simple blood test can reveal how smokers break-down nicotine in their bodies.

When nicotine levels in their bodies drop, smokers crave for more cigarettes. Smokers don't have the same metabolic rate when it comes to nicotine, however.

For those with normal metabolism, nicotine levels drop faster for 60 percent of the smoker population. This means this type of smokers find it more difficult to quit.

Researchers then compared the effectiveness of a non-nicotine based drug called "varenicline" with a nicotine patch. Normal metabolizers of nicotine yielded more successful instances of kicking the habit with varenicline.

Study co-author Rachel Tyndale from the University of Toronto said this data shows using varenicline as a treatment for normal metabolizers can be as effective as a nicotine patch is for slow metabolizers.

This study involved some 1,246 smokers who wanted to quit. It was published in The Lancet Respiratory Medicine journal.

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