Wiktionary
addictively
adv. In an addictive manner.
Usage examples of "addictively".
And yes, I agree, given something like JEVEX, they could get so addictively immersed that they wouldn't know whether they were in it or out of it.
In the end, a reporter for Collier's magazine, together with a government chemist, finally exposed the elixir as an addictively lethal blend of chloroform, cocaine hydrochloride, acetanilid, and botanicals.
That nobody who's ever gotten sufficiently addictively enslaved by a Substance to need to quit the Substance and has successfully quit it for a while and been straight and but then has for whatever reason gone back and picked up the Substance again has ever reported being glad that they did it, used the Substance again and gotten re-enslaved.