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This neurotransmitter provides a feeling of well-being that is usually produced by natural rewards, but drugs like nicotine maximize it

INTRODUCTION Smokers are more likely to suffer severe outcomes of COVID-19 including hospitalization, intensive care unit admission, and death 1,2

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Data availability The data that support the findings of this study are available from the National Health Insurance Service of Korea (NHIS), but restrictions apply to the availability of these data, which were used under license for the current study, and so are not publicly available