Is Secondhand Smoke Still a Major Risk for Lung Cancer?

Secondhand smoke also known as passive smoking or environmental tobacco smoke remains one of the most underestimated yet serious public health threats worldwide. While active smoking is widely recognized as the leading cause of lung cancer, many people still question whether exposure to someone else’s smoke is truly dangerous. The answer, backed by decades of scientific research, is clear: yes, secondhand smoke is still a major risk factor for lung cancer even today.