Pancreatic cancer is often not associated with smoking in the public mind, despite a well-established link between the two, according to Dr. Mohammad Khalil, a medical oncologist at Houston Methodist. “Smoking is a well-established risk factor for pancreatic cancer, but public awareness of that link is low,” Dr. Khalil stated.
Pancreatic cancer has become the third-leading cause of cancer-related deaths in the United States. The pancreas plays important roles in digestion and blood sugar regulation. Because of its location deep within the abdomen and its shared ducts with the bile system, symptoms of pancreatic issues can be difficult to identify.
“Pancreatic cancer typically doesn’t cause any noticeable symptoms in the early stages,” Dr. Khalil explained. “One of the most common symptoms is jaundice, where the skin and eyes turn yellow. Jaundice without pain is one of the red flags.” Other potential signs include unexplained abdominal or back pain, loss of appetite or weight loss, nausea or vomiting, light-colored stools or dark urine, and new-onset diabetes without weight gain.
The prognosis for pancreatic cancer remains poor compared to other major cancers; if detected before spreading beyond the pancreas, there is a 44% five-year survival rate—dropping to 13% when diagnosed at more advanced stages. “Part of what makes pancreatic cancer so deadly is that it doesn’t cause obvious symptoms until it’s progressed to a stage that’s harder to treat,” said Dr. Khalil. “It’s also a very aggressive cancer. More than 80% of cases are diagnosed at an advanced stage.”
Decades of research have established smoking as a significant modifiable risk factor for pancreatic cancer; smokers are about two to three times more likely than non-smokers to develop this disease and smoking contributes to roughly 20% of all cases. Cigarette smoke contains thousands of chemicals—at least 70 are known carcinogens—that circulate throughout the body after inhalation and can accumulate in organs such as the pancreas.
“When the chemicals in cigarettes are inhaled, they find their way outside of the lungs,” said Dr. Khalil. “The carcinogens circulate in the blood and end up in different organs. The pancreas receives a high volume of blood, allowing the cancer agents to accumulate and start the damage.” These substances can trigger genetic mutations leading to tumor formation and may alter immune responses that make treatment more challenging.
There is evidence that quitting smoking lowers this risk over time: “Quitting smoking absolutely reduces the risk of pancreatic cancer,” said Dr. Khalil. “We know the benefits begin right away, and the risk goes down significantly within about two to five years.” After ten to fifteen years smoke-free, former smokers’ risks return nearly equal those who never smoked: “Every year without smoking lowers your risk.”
While tobacco use remains one major contributor, genetics play an important role as well: around 10% of cases involve inherited mutations according to Dr. Khalil: “People with multiple relatives who’ve had pancreatic, breast, ovarian, colon or prostate cancer should consider genetic counseling.” Additional factors include age (most diagnoses occur after age sixty), gender (higher rates among men), race (Black Americans face higher incidence), chronic pancreatitis or diabetes diagnoses, obesity—particularly central adiposity—and heavy alcohol consumption linked with increased pancreatitis risk.
Unlike some other cancers such as breast or colon cancers where routine screening programs exist for early detection,there are no standard screening guidelines for pancreatic cancer. However certain groups—those with family history or known genetic syndromes—may qualify for targeted surveillance programs based on personal health history.
Dr. Khalil emphasized awareness as key: “Quitting smoking is the single most impactful way to reduce your risk,” he advised patients concerned about family history or experiencing unexplained symptoms like jaundice or weight loss.
