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https://iku.moh.gov.my/images/IKU/Document/REPORT/NHMS2018/NHMS2018ElderlyHealthVolume2.pdf
3. Patterns of Smoking Prevalence among the Elderly in Europe
4. The Older Smoker
5. Prevalence of smoking and its associated factors with smoking among elderly smokers in Malaysia: findings from a nationwide population-based study