This includes the smoke that is breathed out and the smoke going directly into the air from a cigarette or pipe. Passive smoking can lead to lung cancer in those who don't smoke. It can also cause breathing problems in people who have asthma. Smoking and drinking alcohol may make you more likely to get mouth cancers. Tobacco smoke is made up of various chemicals that make smoking addictive and unhealthy.
Nicotine causes the blood vessels to narrow, which then affects blood pressure.
Nicotine also makes the heart beat faster. However, these effects only happen when you smoke tobacco, not when you use nicotine in other forms such as nicotine replacement therapy. This is because smoking delivers nicotine to the body very quickly. Tar Tar is a black substance that comes from burning tobacco. It is released in tobacco smoke in the form of tiny particles.