schizophrenia and smoking
... that studies across 20 countries show a strong association between schizophrenia and smoking?
... that studies across 20 countries show a strong association between <b id="mwApw"><a class="mw-redirect" href="./Schizophrenia_and_smoking" id="mwAp0" rel="mw:WikiLink" title="Schizophrenia and smoking">schizophrenia and smoking</a></b>?