Nicotine presence can be detected in the blood for a short period only (about 48 hours) . However, its metabolite, cotinine, can be detected up to about three weeks from the last use and the cut-off detection levels is 200 ng/ml.
Q: What is the purpose of toner? Our skin is happiest at a pH of 5.5. Toner balances the pH of your skin. If you are acne prone the skin is too acidic. So finding a slightly alkaline toner can help balance the acidic nature. If the skin is dry, it is too alkaline, so finding a toner that has a lower pH can bring it to a happy balance of 5.5. Toning 1 minute after cleansing allows all the beneficial molecules to absorb into the skin as it is still wet.
What is pH? PH is a scale that measures how acidic or alkaline a substance is. The scale ranges from 1 to 14 with 1 being very acid, 7 neutral and 14 very alkaline. So what does pH have to do with you and your blood? Well, the pH of your blood is extremely important. The ideal pH level for your blood is right around 7.35 and your body goes to enormous lengths to maintain this level.