So is gambling addictive?
Gambling is an action, not a substance. Actions are not "addictions". Substances are.
So there is no such thing as a gambling addiction?
Correct. You cannot describe a psychological behaviour, even if chronic, even if self-destructive or self-delusional, as an "addiction". Again that's playing loosely with a definition. It would be more accurate to describe the chain of cigarettes that gambler puffs on while gambling, as an "addiction".
The difference is --- if the cigarette supply is suddenly interrupted, the body experiences physiological changes in reaction. If the gambling opportunity is suddenly interrupted --- it does not.
Fairly simple really. It's either a one or a zero. With an action --- it's a zero.
Because again, as already stated by myself and others -- under a definition that loose, anything a person does more than once can be labeled an "addiction". And when you go down that road, you suck all the meaning out of the term.