Harmful Chemicals Found in Cigarettes
Executive Summary about the dangerous of smoking by Wilson Chia

As smokers, little attention is paid to the harmful chemicals found in cigarettes or chose to ignore them. Tobacco smoke contains more than 4,000 chemicals with at least 400 poisonous and more than 50, cancer-causing ones.

Nicotine
Nicotine is a strong poisonous and addictive drug.

Tar
Tar is a black and sticky residue used to cover road surfaces. It clogs up the lungs and causes lung cancer.