Cigars Are No Better

May 15, 2015

By Medical Discovery News

Person smoking a cigarette

A common argument made by those who smoke cigars is that they are safer than cigarettes.  However, several studies argue that this is not true.

Cigar smoking has increased dramatically in the U.S. Between 2000 and 2011, small cigar sales rose 65 percent and large cigar sales increased 233 percent. Americans smoked more than 13 million cigars in 2010, twice the number from 2000. About 13.4 million people age 12 or older smoke cigars. A cigar culture has arisen, with cigar bars or clubs, shops with walk-in humidors, and magazines for those who consider themselves cigar connoisseurs. Their use among sports figures and celebrities has made them seem fashionable or sophisticated, a symbol of status or success.

The tobacco in cigars is cured and fermented to enhance the flavor, but this process also increases the amounts of harmful ingredients. Cigars come in three basic sizes, but the classic cigars are the large ones that contain more than half an ounce of tobacco, and some contain as much as an entire pack of cigarettes.

Just like cigarettes, cigars contain nicotine and can be very addictive. Most people who smoke cigars do not inhale, and therefore the nicotine is absorbed more slowly. However, cigar smoke dissolves more easily in saliva than cigarette smoke, enhancing the amount of nicotine absorbed.  Smokers absorb one to two milligrams of nicotine out of the eight total milligrams in cigarettes. The large cigars contain anywhere from 100 to over 400 milligrams of nicotine, and the amount a person absorbs varies greatly depending on how long the cigar is smoked, how many puffs are taken, and how much smoke is inhaled. Second- and third-hand cigar smoke is dangerous, just like it is with cigarettes.

In one study, scientists measured the levels of two biomarkers for tobacco as well as arsenic and lead in over 25,000 cigar smokers. Cigar smokers had higher levels of these carcinogens than nonsmokers and equal levels to cigarette smokers. Overall, the study found that cigars are not safer than cigarettes. Cigar smokers are less likely to develop lung cancer than cigarette smokers, but they are at higher risks of developing other cancers.

Those who inhale while smoking cigars are more likely to develop laryngeal cancer, lung cancer, bladder cancer, pancreatic cancer, and cancers of the tongue, mouth, or throat than nonsmokers. Even those who don’t inhale the smoke directly still inhale the secondhand smoke and are at an increased risk of lung cancer. Cigar smokers are four to 10 times more likely to die from cancers of the mouth, larynx, and esophagus than nonsmokers.

Cigar smoking also increases the risk of other diseases including emphysema, chronic bronchitis, heart attacks, gum disease, and erectile dysfunction. One long-term study determined that cigar or pipe smoking costs people 10 years on average – they spent an extra five years in bad health and died five years earlier.

So before you take up cigars in an attempt to look cool, ask yourself if your image is more important than your health.

For a link to this story, click here.

Rise of Cavities

August 9, 2013

By Medical Discovery News

By 65, 92 percent of Americans have cavities in their permanent teeth, and an average of 3.28 teeth missing or decayed. The answer to why this is may not concern toothpaste ingredients or brushing time, but the lifestyles of ancient humans, as two new studies have discovered.

Humans used to live as hunter-gatherers, meaning they hunted for game and foraged for plants to eat. They were mainly nomadic, following herds to keep their food source. That changed about 10,000 years ago when agriculture was invented. They began to settle down in one place, raising livestock and growing crops for food. The human diet changed as it now included more starch from the grains they harvested.

The breakdown of starch begins with enzymes in the mouth that split the starch into shorter chains of sugars. The process continues in the stomach and the small intestine until the sugar chains are broken down into individual sugar molecules. This leaves a residue of sugar in a film on and between teeth, creating an ideal environment for the growth of bacteria. Two recent studies have documented how this change in diet caused bacteria associated with cavities and periodontal disease to emerge and eventually become widespread.

One group analyzed the bacterial DNA in samples of tarter from ancient teeth to monitor the changes in the types of bacteria that were present. What they found was a record of how humans have wrecked the bacterial ecosystem in their mouths. The increase in starchy foods caused sugar-loving bacteria to flourish.

With new DNA sequencing technologies, scientists isolated bacterial DNA from 34 teeth of Northern Europeans that are 7,000 to 400 years old, including the last hunter-gatherers from Poland and early farmers from Germany. Hunter-gatherers’ teeth harbored fewer types of cavity-causing bacteria, while early farmers’ teeth revealed a sharp increase in bacteria that cause tooth decay and periodontal disease. 

One bacterium, called Streptococcus mutans, contributes to cavities, diabetes, and cardiovascular diseases. In the mid-1800s, Strep mutans became even more dominant in the oral microbiome. This change correlates with the Industrial Revolution, which introduced refined grains and sugars. The simple sugars from these processed foods are the basis for microbial fermentation, which lowers the pH of the mouth and causes damage to tooth enamel.

The second study focused on changes in the DNA of Strep mutans alone from the present then going back in time. They sequenced the genomes of the bacterium from 57 people worldwide, then used some clever genetics modeling to calculate when the Strep mutans started expanding and diversifying. They think that occurred about 10,000 years ago, which correlates to the start of agriculture. 

Both studies show that the oral microbiome changed with the development of agriculture. What neither group has dealt with are the influences of modern behaviors like using toothpaste, adding chlorine and fluoride to drinking water, and more changes to the human diet, particularly the shift to fast food.

 For a link to this story, visit http://www.medicaldiscoverynews.com/shows/351-rise.html.