Smokers, vegetarians at lesser risk of contracting coronavirus: CSIR serosurvey Smokers, vegetarians at lesser risk of contracting coronavirus: CSIR serosurvey Smokers and vegetarians were found to have lower seropositivity indicating that they may be at a lesser risk of getting infected by coronavirus, according to a pan-India serosurvey conducted by the Council of Scientific and Industrial Research in its nearly 40 institutes. advertisement UPDATED: January 18, 2021 00:29 IST The CISR survey suggested that smokers and vegetarians are less likely to be seropositive (Picture Credits: Representative/PTI) Smokers and vegetarians were found to have lower seropositivity indicating that they may be at a lesser risk of getting infected by coronavirus, according to a pan-India serosurvey conducted by the Council of Scientific and Industrial Research (CSIR). The survey was conducted across CSIR's nearly 40 institutes.