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.
A little note: If you love using natural soaps on your face and are really worried about pH try adding a pH balancing toner by mixing 1 part apple cider vinegar with 4 parts water. It is important to remember that . . . all soap bars are not created equal! I found so many articles written about the evils of soap that began with words like, Using a harsh bar soap with a high pH... But, what is the harsh bar soap?