Substance abusers are at greater risk of contracting Covid-19, according to recent studies, a worrying fact as use of synthetic opioids gradually increases in Europe.Users of opioids or tobacco face a greater risk of catching the coronavirus and are more likely to suffer a more serious case of Covid-19 and to die, says a recent study by the National Institutes of Health in the US.The study, published in Molecular Psychiatry, a trade journal, assessed more than 73 million patients and found that people with opioid use disorder are at a particularly high risk.Nora Volkow, who heads the National ...