Vaping vs Smoking vs IQOS: Which is Least Harmful? Vapes might be less harmful than traditional cigarettes and might help smokers quit smoking, but they are not safe, especially for individuals younger than 25 years old. Plus, much is still unknown How dangerous IS vaping compared with smoking? New review analyzes the dangers of both. and finds former is linked to EIGHT lung diseases Daily Mail Online A decade ago, the most frequent opinion among smokers was that vaping was less harmful than tobacco. But ten years on, the opposite is true: over a third say that vapes are Smoking vs Vaping Which Is Worse?