Lung cancer kills more Americans than all other types of cancer, but only 20 percent of American adults surveyed by the National Lung Cancer Partnership said they were aware of the fact, the cancer advocacy group said in a statement released this week.

Eighty percent of the adults surveyed did not know that lung cancer was the leading killer among cancers in the US. Only 1 in 8 respondents—12 percent—said they knew that an ongoing cough; back, shoulder, and chest pain; wheezing and shortness of breath; and coughing up blood could be symptoms of lung cancer.

The National Lung Cancer Partnership conducted the online survey of 1,000 U.S. adults aged 18 and older.

In 2006, the most recent year that data was available on lung cancer statistics, almost 200,000 Americans were diagnosed with lung cancer and almost 160,000 in the U.S. died from the disease, according to the Centers for Disease Control and Prevention (CDC).

The most popular incorrect answers that respondents gave when asked which cancer was the most deadly were breast cancer and prostate cancer. Seventy-five percent of men surveyed wrongly believed that prostate cancer killed more men than lung cancer, and 83 percent of women surveyed incorrectly thought that breast cancer was more deadly than lung cancer.

In fact, lung cancer caused more deaths in 2006 than breast cancer, prostate cancer, and colon cancer combined, the CDC said.