Jeremy has responded to the stress of his parents' divorce with excessive alcohol consumption and habitual smoking. these behaviors are most likely to place jeremy at a heightened level of risk for

MAJOR DEPRESSIVE DISORDER. Here Jeremy's parent took divorce and
this has led major impact on Jeremy's life. 
 And Jeremy stressed due to this and started excessive consumption of
alcohol and more smoking.   
 Due to this kind of activity, any human being usually spoil their own life. 
 Instead of getting rid off from stress or depression, it effect reverse. And this
is most likely to happen with Jeremy which can place him in risky zone for his
entire life.  Jeremy should think more about his own life which is left rather getting more
stress and choosing the path of alcohol and smoking.