Which is the leading cause of death for Americans ages 15 - 44, and how does alcohol consumption contribute to these deaths?

Unintentional injuries (accidents), because alcohol impairs judgment and coordination increasing crashes, overdoses, drownings, and falls. 

Heart disease, because alcohol causes immediate heart attacks in young adults by rapidly raising blood pressure. 

Cancer, because alcohol is the primary cause of most cancers in young adults and thus the leading cause of death. 

Infectious diseases, because alcohol suppresses the immune system and makes young adults far more likely to die from infections.