You know the study consisted of a rat choosing between a rice cracker and an Oreo, and the rats preferred the Oreo. Then they had another choice test between a saline solution and cocaine and the rats preferred cocaine. It hardly shows that Oreo's are as addictive than cocaine, just that they taste better than rice crackers...... but then so does sawdust.
It's worth noting that cocaine does not cause physiological dependence or withdrawal and its addiction is purely psychological in nature. It's a very dangerous drug, but not for the same reasons as, say, alcohol or heroin. Addictiveness does not equate to the potential for harm.
True, insofar as withdrawal from alcohol can kill you for purely physical reasons, and withdrawal from cocaine will not.
Unfortunately, to most readers, "purely psychological" implies that the issue is of the mind, not of the physical brain - that it is somehow an issue of willpower rather than brain chemistry.