Alcohol:

BVA Citation Nr: 0718929

Although the law prohibits compensation for primary alcohol 
abuse which begins in service, and also prohibits 
compensation for conditions which are secondary to such 
primary alcohol abuse, the law does not prohibit compensation 
for an alcohol abuse disorder which is secondary to an 
established service-connected condition (such as when 
secondary to a service-connected psychiatric disorder). 
Allen v. Principi, 237 F.3d 1368 (Fed. Cir 2001).