Scientists have long believed that all addictions -- from alcohol and drugs to smoking and binge-eating -- were connected.

In the past few years, laboratory tests have confirmed these theories, putting researchers closer to finding a single drug that would treat most addictions, according to the current edition of Newsweek.acc

Researchers have identified brain chemistry that most addictions have in common. They have also discovered that several drugs, among them Topamax (topiramate), which are prescribed for other illnesses, are also effective in treating addiction.

Currently, doctors turn to psychotherapy and "anti-compulsion" drugs to help addicted individuals curb their cravings. While the measures work short-term, most patients relapse over time.

Topiramate, which is used to prevent seizures among epileptics, is perhaps the most promising of the "universal" anti-addiction drugs being studied. Recent studies with topiramte on patients addicted to alcohol and tobacco have shown successful results. However, the slight risks of acute glaucoma and kidney stones may slow widespread use.

Other drugs that scientists are examining include the diet drug Acomplia (rimonabant), which studies have shown to reduce cravings for nicotine and alcohol, and the muscle relaxant baclofen, which appears to curb the desire for alcohol.