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Smokers and Vegetarians Are Less Likely To Contract COVID-19: CSIR Survey

A recent survey conducted by CSIR (Council of Scientific Industrial Research), Government of India, has revealed that smokers and vegetarians are less likely to contract COVID-19 infection. The survey suggested smoking may be protective, despite COVID-19 being a respiratory disease, due to its role in increasing the mucous production that may be acting as the first line of defense among the smoking population.

It indicated that vegetarian food rich in fiber might have a role to play in providing immunity against COVID-19 due to its anti-inflammatory properties by modification of gut microbiota.

The pan India survey was conducted by an eminent team of 140 doctors and research scientists to study the presence of antibodies against SARS-CoV-2, the virus that causes COVID-19, and their neutralization capability to infer possible risk factors for infection.

The study assessed 10,427 adult individuals working in more than 40 CSIR laboratories and centers in urban and semi-urban settings spread across and their family members.

These people voluntarily participated in the study.

To be sure, studies-based surveys may have limitations of over-simplification and sampling bias.

Earlier, two studies from France and similar reports from Italy, New York, and China reported lower COVID infection rates among smokers.

A study by US Centers for Disease Control and Prevention (CDC), which examined over 7,000 people who tested positive for COVID-19, also vindicated the above findings.

Interestingly, the study found that only 1.3 percent of survey participants were smokers, compared to the CDC report that 14 percent of all Americans smoke.

Similarly, UCL (University College London) academics that looked at 28 papers across the UK, China, US, and France found the proportions of smokers among hospital patients were lower than expected. One of its studies showed that in the UK, the proportion of smokers among COVID-19 patients was just five percent, a third of the national smoker’s rate of 14.4 percent.

Another study in France found the rate of smokers who contracted COVID-19 was 7.1 percent, which is four times lower than the national smoker’s population rate of 32 percent.

In China, a study noted that only 3.8 percent of patients were smokers – despite more than half of the population regularly smoking cigarettes.

In a separate study by Jin-jin Zhang to understand the influence of smoking behavior on Coronavirus’s susceptibility, only 9 (6.4%) patients had a history of smoking, and 7 of them were past smokers.

The study found that smoking populations were less likely to be infected with SARS-CoV-2. These findings were also confirmed by a French study of public health data that showed people who smoke were 80 percent less likely to fall prey to COVID-19 than non-smokers of the same age and sex.

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