The Collaborative International Dictionary of English v.0.48:

White plague \White plague\
   Tuberculosis, esp. of the lungs.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

white plague
    n 1: involving the lungs with progressive wasting of the body
         [syn: pulmonary tuberculosis, consumption, phthisis,
         wasting disease, white plague]
    2: an addiction to a drug (especially a narcotic drug) [syn:
       drug addiction, white plague]