A 742-participant study found that 18% of smokers with lung cancer and 12% of those with colorectal cancer still continued the habit after diagnosis. The study in the journal Cancer Epidemiology, Biomarkers & Prevention also found that 25% of caregivers for lung cancer patients and 20% for colorectal cancer patients continued to smoke. The researchers said smoking can interfere with treatment and increase the risk of developing a secondary cancer.

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