You may wonder if smoking cigarettes has any effect on your bowels, like coffee does. After all, isn't nicotine a stimulant, too?
But the research on the intersection between smoking and diarrhea is mixed.
Read on to learn more, as well as the other harmful side effects of cigarettes.
Laxatives are substances that can free up stool that's stuck or impacted in your large intestine (colon), letting it pass more easily through your colon.
Laxatives may also be used to cause the muscle reactions in your bowel that move stool along, which is called a bowel movement. This type of laxative is known as a stimulant laxative because it 'stimulates' a contraction that pushes stool out.
Many people feel nicotine and other common stimulants like caffeine have a similar effect on the bowels, causing an acceleration of bowel movements. But the research tells a more complicated story.
So, what does the research actually say about smoking and bowel movements? Does it cause diarrhea?
The short answer: We don't know for sure.
Few direct links have been found between smoking a cigarette and having a bowel movement. But a lot of research has been done on the effects of smoking on inflammatory bowel disease (IBD), of which diarrhea is a major symptom.
The first thing to know is that smoking may make diarrhea symptoms of IBD — like Crohn's disease, a type of IBD — more severe.
A 2018 review of research on smoking, Crohn's disease, and ulcerative colitis (another type of IBD) concluded that nicotine therapy may help control the symptoms of ulcerative colitis for former smokers — but it's only temporary. There's no long-term benefit. There have also been reports that smoking can actually increase ulcerative colitis activity.
On top of that, researchers note smoking can raise your risk for developing Crohn's disease. It can also make the symptoms much worse due to inflammation in the intestines.
Moreover, smoking may also raise your risk for bacterial infections that affect the intestines and cause diarrhea.
A 2015 study including more than 20,000 participants published in BMC Public Health found that those who smoke had a higher infection rate of Shigella bacteria. Shigella is an intestinal bacterium often responsible for food poisoning, which leads to diarrhea.
On the other hand, the same study found that smoking causes the stomach to produce more acid, so smokers are less likely to develop Vibrio cholera infections. This is another bacterium that commonly causes infections and diarrhea.
And there's more research that shows just how uncertain the link is between smoking and bowel movements.
A 2005 study looked at the effects of several stimulants, including coffee and nicotine, on rectal tone. This is a term for the tightness of the rectum, which has an effect on bowel movements.
The study did find that coffee increased rectal tone by 45 percent. It found a very minor (7 percent) increase in rectal tone from nicotine — which was almost as high as the effect by a placebo water pill at 10 percent. This suggests that nicotine may have nothing to do with pooping.
Smoking affects the entire body, including every part of your digestive tract. Here's what can happen that may cause or worsen diarrhea and other major GI conditions:
Quitting is hard, but not impossible. And quitting sooner rather than later can help you reduce the symptoms that nicotine can cause on your digestive tract and heal your body from its effects.
Try some of the following to help you quit:
So, smoking probably doesn't make you poop, at least not directly. There's a whole host of other factors that might be responsible for this sensation of urgency to visit the toilet after smoking.
But smoking does have a major impact on your gut health. It increases your risk for bowel disorders that can cause diarrhea and other GI symptoms.
Quitting can reduce and even reverse some of these effects. Don't hesitate to try some quitting strategies or reach out for help to break this habit.