Coronavirus disease-2019 (Covid-19) disease, which is now a global health problem, might endanger some vulnerable groups including addicts at a higher risk. Apart from that fact, there are currently some misconceptions around the relationship between addiction and chance of becoming infected by new corona virus, with some supporting the idea of protective effect of addiction against Covid-19 disease. In this letter, we have attempted to make the situation clear by providing related evidence on the vulnerability of addicted people against this disease....