Nitrates and nitrites, widely used as food additives in products such as smoked meats and fish, can undergo reactions in the stomach to yield nitrosamines, which are considered to be carcinogenic. The reaction is encouraged when the compounds are subjected to high heat, such as takes place when bacon is cooked. Since both nitrates and [...]

A number of factors may combine to cause bronchial asthma. Of these, allergy, infection, genetic constitution, and emotional influences are the most important. However, as is often the case in the history of medicine, the last twenty or thirty years have seen an overemphasis on one of these factors at the expense of the others. [...]