How many years must pass after quitting smoking to reduce the risk of cancer?

Sustained smoking cessation is associated with a reduced risk of cancer 10 years after quitting, according to a study published in JAMA Network Open.

The research team behind the study, led by Dr. Eunjung Park of the Graduate School of Cancer Science and Policy at the National Cancer Center in Goyang, South Korea, conducted a study of approximately 2,974,820 Korean participants aged 30 and older.

As they confirmed, 196,829 cancer cases were observed during an average follow-up of 13.4 years. Participants who had completely quit smoking had a lower risk of cancer compared to continuous smokers, with hazard ratios of 0.83 for all types of cancer and 0.58, 0.73, 0.86 and 0.80 for lung, liver, stomach and bowel. thick.

As for the risk of lung cancer, which is directly related to smoking, for those who stopped smoking there was a three-year decrease compared to other types of cancer.

The greatest reduction in lung cancer risk associated with smoking cessation was seen before age 50 compared with age 50 and older.

"The findings highlight the importance of promoting smoking cessation, providing adequate support and resources for sustained cessation, and encouraging early cessation to reduce cancer risk," the researchers note./ CNA

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