Genetic differences exist between different racial groups which affect the risk of developing alcohol dependence. For example, there are differences between African, East Asian and Indo-racial groups in how they metabolize alcohol. These genetic factors are believed to, in part, explain the differing rates of alcohol dependence among racial groups.   The alcohol dehydrogenase allele ADH1 B*3 causes a more rapid metabolism of alcohol. The allele ADH1 B*3 is only found in those of African descent and certain Native American tribes. African Americans and Native Americans with this allele have a reduced risk of developing alcoholism.  Native Americans however, have a significantly higher rate of alcoholism than average; it is unclear why this is the case.  Other risk factors such as cultural environmental effects . trauma have been proposed to explain the higher rates of alcoholism among Native Americans compared to alcoholism levels in caucasians.  
If someone close to you is displaying signs of alcohol addiction, it can be difficult to know what to do. You might feel worried about them, frustrated that they don’t seem to want help or frightened for them or even by them (2). All of these feelings are normal and there is help out there both for alcoholics and those caring for them.
Women who are planning to become pregnant or who have recently learned they are pregnant should not drink alcohol. It is wise to seek the advice of a health care provider if alcohol cannot be stopped prior to conception and throughout pregnancy. Both the Centers for Disease Control and The . Surgeon Generals Office warn women not to drink during pregnancy.
Tetrault, ., et al. "Effects of marijuana smoking on pulmonary function and respiratory complications: a systematic review." Archives of Intern Medicine . February 2007.
NCADD. Learn About Alcohol: Signs and Symptoms.