This is a retrospective single centered study that was done in the ICU on patients with Covid-19 between 16th of March -16th of May in 2020 Retrospective records will be examined by examining the electronic data files of the patients.

There were two groups as smoker and non-smoker.

The aims of the present study is to see the effects of smoking prevalence, the length of stay regarding the usage of cigarettes, and the effects on the mortality of COVID-19 in our intensive care unit(ICU).

This is a retrospective single centered study that was done in the ICU on patients with Covid-19 between 16th of March -16th of May in 2020. The demographic data, comorbidity status, the units they were accepted from, clinical symptoms , respiratory support, prevalence of smoking, length of stay in the ICU and mortalities of the patients weill be recorded. There are two groups as smoker and non-smoker.

Inclusion Criteria:

• All the patient's data are diagnosed with acute respiratory syndrome Covid-19 over 18 years old

Exclusion Criteria:

• Patients under 18 years of age

Conditions regarded to the usage of cigarettes will be recorded as patients who are active smokers and patients who do not smoke.