Survivors were more likely to smoke if they were younger, had less education and income, or drank more alcohol.
About 40 percent of smokers said they planned to quit within the next month, but this intention was lower among survivors who were married, older, or smoked more.
"Smoking is addictive and having cancer does not guarantee that you will stop, even if that cancer was directly tied to your smoking," said Westmaas. "We need to do more to intervene with these patients."