evidence: Epidemiological studies consistently show that smokers are less likely to develop Parkinson’s. This isn’t a reason to start smoking, as the health risks associated with it far outweigh any potential benefits. However, this research suggests that specific ingredients in cigarettes might have therapeutic potential in Parkinson’s. Nicotine, the main component of cigarettes, has been shown to protect neurons against damage in rodents and monkeys. However, clinical trials have failed to show a similar effect in people with Parkinson’s.