Nicotine is one, and it is the one that causes addiction. The other is carbon monoxide which binds 40 times stronger to hemoglobin than oxygen. That lack of oxygen is what is part of the "high" feeling you get from smoking. You actually deprive your brain of oxygen.
Nicotine
There are several hundred harmful chemicals in cigarette smoke. The most notable are probably tar and nicotine.
Nicotine
You can inhale the cigarette smoke, but not the cigarette. To smoke is to inhale the smoke when it's in your lips. You also can inhale the smoke when the cigarette smoke is near to your nose, or through your open mouth. But never try to do it. Smoking is very harmful.
All drugs that you smoke are harmful to your lungs; cannabis, nicotine, crack etc.
Cigarette smoke contains carbon dioxide, along with many other harmful chemicals and toxins.
Second hand smoke is just as harmful as if you were the one smoking the cigarette. It will effect your lungs, heart, and can cause cancer.
There are many substances in cigarette smoke, but the most popular ones are Butane and Methane. These chemicals are released in cigarette smoke and can cause many health issues.
tar.
The three main chemicals in cigarette smoke are nicotine, tar, and carbon monoxide. These chemicals are known to be harmful to health and are associated with various diseases such as cancer, respiratory issues, and heart disease.
All types of smoke have tar, which gets into the lungs and causes emphysema and/or chronic bronchitis. The only difference between pipe smoke and cigar/cigarette smoke is that pipe smoke - in my opinion - smells better.
Cigarette smoke is a solute because it is a substance that is dissolved in air, which acts as the solvent. When tobacco burns, it releases various chemicals and particles into the air, creating a solution of smoke.