different between addictiveness vs addictivity

English

addictive +? -ness

addictiveness (uncountable)

addictive +? -ity

addictivity (usually uncountable, plural addictivities)

(medicine) The characteristic of being addictive.
- 2004, Lowinson et al, Substance Abuse: A Comprehensive Textbook
  At any one time, 70% of smokers would like to be able to quit but cannot do so primarily because of the extraordinary addictivity of nicotine.

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