a. cocaine
b. alcohol
c. marijuana
d. heroin

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Answers:    Alcohol (technically)

ETA: http://www.healthatoz.com/healthatoz/Ato...

http://www.oas.samhsa.gov/dependence.htm...

http://psychcentral.com/disorders/sx16.h...

*searching everywhere for my past talk notes that show that EVEN Caffeine is most addicting; However, in attendance are different issues here: addiction, withdrawal, dependence, and tolerance (all of which play a huge role).

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Heroin my dear

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