I quit smoking cigarettes in 1969, five years after the U.S. Surgeon General’s first report said that smoking causes lung cancer. I was convinced the report was right when it came out, but it took me five years to develop the willpower to give up my Marlboros.

The body can make all the cholesterol it needs. Most cholesterol is made by your liver. You also get cholesterol from foods such as meat, eggs and dairy products. Too much cholesterol is dangerous, because cholesterol can lead to blockages in your blood vessels.

Triglycerides are a fat in your blood. They are essential for maintaining good health. However, if your triglycerides get out of control, you can put your heart at risk. People with high triglycerides usually have lower HDL (good) cholesterol and a higher risk of heart attack and stroke.

The first thing you should know is that antibiotics are used to combat bacteria, not viruses. So, these potent drugs should be used for infections of the ear, sinuses, urinary tract and skin. They’re also used to treat strep throat. They should not be used for viruses that cause most sore throats, coughs, colds and flu.

The American Psychiatric Association classifies compulsive gambling as an impulse-control disorder. Imbalances in the brain chemicals serotonin, norepinephrine and dopamine may be factors in compulsive gambling. Many people are able to control their compulsive gambling with medications and psychotherapy, and with the aid of self-help groups.

For several reasons, seniors are in danger of breaking a bone. As we age, the power of our senses, reflexes and coordination diminishes. Maladies and the medicines we take for them can contribute to balance problems, which can lead to falls. Then there’s osteoporosis—a disease that makes bones more likely to snap.

Sometimes you take a contrast medium such as barium and iodine to outline an area of your body. This medium may be injected, swallowed or taken as an enema. The contrast medium appears opaque on X-ray film, providing clear images of structures such as your digestive tract or blood vessels.

These products may not be safe if you have cancer, an enlarged prostate gland, high blood pressure, diabetes, glaucoma, heart disease, epilepsy, Parkinson disease, psychiatric issues or problems with clotting blood, your immune system, liver or thyroid.