Tobacco smoke contains over 4000 chemicals in the form of particles and gases. The main constituents are Nicotine - an addictive drug that stimulates the nervous system raising heart rate and blood pressure, Tar which holds most of the 4,000 chemicals and is absorbed into the body via the lungs and Carbon Monoxide a poisonous gas that effects the arteries of smokers and can lead to both circulatory and heart problems in later life. Of the other thousands of chemicals you will find in passive smoke the worst are known carcinogens such as Arsenic, Toluene, Cyanide and many more.
Tobacco was introduced to Europe from the New World at the end of the fifteenth century. Smoking spread rapidly and was long regarded as having medicinal value. It was not until the 20th century, however, that smoking became a mass habit and not until after the Second World War that the dangers of smoking were firmly established.
Tobacco use, particularly cigarette smoking, is the single most preventable cause of death in the United Kingdom. Cigarette smoking alone is directly responsible for at least one-third of all cancer deaths annually in the United Kingdom, and contributes to the development of low birth weight babies and cardiovascular disease.
I do feel better, not a lot but enough that I'm glad that I quit. A lot of my "mysterious" ailments are gone, ones that I used to experience on a daily basis. I know for a fact that my stomach pains are gone due to the decrease of stomach acid since I quit. People with any form of stomach irritation should not smoke.
The various forms of cannabis all come from the plant Cannabis Sativa, which grows throughout the world. The product of its crushed stems (hemp) was formerly vital for rope and sack making.
For a man or women under 30, smoking does not prevent typical age-related weight gain, according to a study of nearly 4,000 white and black young adults ages 18 to 30.