addiction is continued behavior despite harm that would cause a reasonable person to stop

So food addiction could be diagnosed from obesity or hypertension or something, if the negative is enough to cause problems and of appropriate magnitude.

This is the only addiction definition that makes any sense, and is apparently used by the addiction medicene professions.

The whole psych vs phys. addiction is kinda stupid. Addiction is psychological. Abstinance syndroms and tolerance are physical.