Nicotine can damage human cells.
Answer analysis: Nicotine is an alkaloid found in tobacco. It constricts blood vessels, increases blood pressure, and has a variety of negative effects on human organs and systems, including the heart, lungs, nervous system, and digestive system.
Nicotine can increase heart rate and blood pressure, increase the risk of myocardial infarction and stroke, and cause damage to the lungs, leading to emphysema and lung cancer.
At the same time, nicotine can also have effects on the nervous system, including reducing memory and cognitive abilities, affecting sleep quality, and causing anxiety and depression.