Franco has fallen ill and lost his job, and his wife has left him due to his problem with heroin. his friends and family are telling him that he is an addict most likely because he is exhibiting:

The answer is, because he is exhibiting "Substance dependence".

Substance dependence refers to a versatile express that creates from rehashed tranquilize organization, and which brings about endless supply of medication use. A medication addiction, an unmistakable idea from substance reliance, is characterized as impulsive, crazy medication use, notwithstanding negative results.