Alocholics can get aspiration pneumonia, which involves aspiration of the normal oral flora (Klebsiella and anaerobes like Peptostreptococcus, Fusobacterium, Prevotella, Bacteroides). So this is normally part of the flora and can be aspirated in alcoholics.

Hello, i think it is Streptococcus viridans; coccus in chains and normal oral flora. Alcoholics can get aspiration pneumonia, which can evolve to a pulmonary abscess. FA2020 p146. https://www.atsjournals.org/doi/pdf/10.1164/ajrccm.156.5.97-03006