In recent years, research has shown a strong link between heavy smoking and drinking.

The analogy between smoking and obesity is an interesting one.

In 1950, British researchers demonstrated a clear relationship between smoking and cancer.

Such a relationship between continued smoking and less severe disease has also been found in cardiac patients.

Much research has focused on the connection between smoking and exercise.

Other studies have found an association between smoking and strokes in men.

The relationship between smoking and cancer is quite different.

The link between smoking and cancer is too strong to ignore.

The relationship between smoking and cancer is well known.

Studies across 20 countries show a strong association between schizophrenia and smoking.