^ A well-known medical reference text may well be more credible than your abnormal psych book (so would a pharmacology textbook if we are discussing pharmacological/physical addiction); I have consulted The Merck Manual of Diagnosis and Therapy. Let us read.
OPIOID DEPENDENCE
A strong psychologic dependence manifested as an overpowering compulsion to continue taking opioids, the development of tolerance so that the dosage must be increased to obtain the initial effect, and physical dependence that increases in intensity with increased dosage and duration of use.
AMPHETAMINE DEPENDENCE
Some psychologic dependence produced by amphetamine causing elevated mood; increased wakefulness, alertness, concentration, and physical performance; and a feeling of well-being.
Chapter 195 - Drug use and dependence; pp. 1578-1593
-Merck Manual; Seventeenth Edition (1999); most recent publication.
If you check out the reference at your university library, you will also find a table on page 1579 that compares degree of physical dependence, psychological dependence, and tolerance between commonly used drugs. The extent to which each manifests with a given drug is indicated on a scale from 0(no effect) to ++++(marked effect).
Here is a selective reproduction of the relevant parts:
...................Physical Depen.......Psych Dependence......Tolerance
Opioids................++++..................++++....................++++
Synth. Opioids......++++..................++++....................++++
Methamph..............?.......................+++......................++++
You will notice that throughout the chapter, there is no suggestion that amphetamines cause physical dependence. There is no significant evidence thus far to support such an assertion - well, it may be more accurate to say that there is no definitive evidence as yet, maybe some anecdotal or field reports that indicate some kind of physical dependence, but a '?' is most appropriate at this stage.
Clinically, the definition of addiction often varies from one source to another. It is a controversial issue which rarely finds total objective agreement, and can be described by various physical symptoms/behavioural patterns, most commonly those listed above.
Pharmacologically speaking, you would be hard-pressed to argue that smoked meth is more addictive than heroin because we do not yet have solid evidence of the nature of physical meth dependence, infact we do not yet have evidence that physical dependence even exists with methamphetamine use. To understand the difference between psychological and physical dependence, it would be wise to research what we know about the physical addiction and withdrawal that accompanies opioid dependency, and to then compare this to research on psychological dependency. The mechanisms are obviously distinct from one another.
No doubt though that smoked meth can be very addictive - psychological dependence leads to increases in use which gradually amplifies tolerance and so on until a vicious cycle is created and self-reinforced if the user is not helped/doesn't help themselves. People should be aware of how an addiction to a drug like meth begins and takes hold, and they should know themselves and their personality before exposing themselves to the possibility of addiction by using the drug. Hopefully someday (through education not criminal law) susceptible people will be able to swallow their pride and stay away from dangerous drugs without having to learn the hard way.
Meth may be more psychologically addictive than heroin - but this is very subjective; psychological reaction to a psychoactive drug is a personal thing, as is the development of psych. dependence. To the best of my knowledge, I would suggest that heroin is certainly more pharmacologically/physiologically addictive.