In 1845, the sixth US President, John Quincy Adams, wrote a letter to Rev. Samuel Cox in Brooklyn, who was in the process of writing a book about tobacco and smoking. Adams told Cox that when he was a young man, he had been addicted to both smoking and chewing tobacco. When he decided to quit it took him three months.
'I have often wished that every individual afflicted with this artificial passion could force it upon himself to try but for three months the experiment which I made, sure that it would turn every acre of tobacco land into a wheat field, and add five years to the average of human life'.