One puff on a cigarette delivers over 4,000 different chemicals into your body.
Anorexia is an eating disorder in which a person eats almost nothing and is severely underweight. Yet most people with the disease still believe they look fat.
Breast-fed babies whose mothers smoke are exposed to nicotine through their milk, often up to half a cigarette's worth a day.
Recent research suggests that people who smoke are over 50% more likely than non-smokers to have serious relationship problems, including a greater likelihood of suffering from anxiety and depression.
Your fingernails grow almost four times as fast as your toenails.
The average human brain has about 100 billion nerve cells
The strongest bone in your body is the femur (thighbone), and it's hollow!
It takes about 20 seconds for a red blood cell to circle the whole body.
The bird flu virus could evolve into a form that is easily spread between people, resulting in a highly contagious and lethal disease.
The Chinese, in olden days, used marijuana only as a remedy for dysentery.
