Letter to the Editor
                        
                        
                        Somchai Bovornkitti MD, Hon.FRCPE, Hon.MRCP, FRCP, FRACP, Hon.FACP
                        Nicotine is a chemical that contains nitrogen, which is made by several types of
plants, including the tobacco plant. The tobacco plant is indigenous to the Americas for
at least 2,000 years.
                        
                             กรกฎาคม - กันยายน 2568