Really? There is no such thing as psychological dependency?
Now that is a valid argument. OK you hooked me
Smoking creates a complex dependency profile that has multiple components of two types: chemical and psychological dependencies. There are multiple factors in each. Any given individual may exhibit:
1. No dependence at all.
(We could use the term addiction here, justifiably, because we can be reasonably certain that smoking can create dependence and it can be harmful.)
2. Chemical dependence only.
Withdrawal symptoms will include cravings, which may be intense, and long-lived.
Many compounds from the possible 9,600 in the mix have been implicated.
At present, we think that the subsequent nicotine dependence exhibited by many/most smokers is caused by the co-administration with MAOIs, which potentiate ('boost') the effect of nicotine.
There is also evidence that several other compounds may be implicated, such as the WTAs (specifically, anatabine) and even the pyrolytic aldehydes.
After smoking, people may exhibit no / some / powerful chemical dependence symptoms.
3. Psychological dependence only.
The routines and habituation are significant for some people, and nonexistent in others.
Psychologists tend to emphasise the habituation issues, but then they would

When cigarettes and their routines are well-replicated (as with an ecig) and enough nicotine is delivered to create temporary OD (as with a strong / efficient ecig), but the cravings persist, then we can be reasonably sure that we are looking at a chemical dependency.
4. A combination of the above.
Any individual may exhibit any combination (or none) of the above.
In particular, the individual factors (such as certain non-nicotine chemical dependencies, or wanting to smoke after a meal) may be different for different people.
Smoking addiction is complicated. It cannot always be satisfied by switching to an ecig, even a good one and with good mentoring (a high standard of mentoring by an expert is critical to any smoking cessation or avoidance attempt of any kind). Any remaining cravings can usually (but not always) be reduced / removed by the WTA / Snus route in addition. For the very small number of intransigent cases remaining, we know beyond any reasonable doubt that pyrolytic compounds are involved. Luckily these cravings can usually be beaten over time - the need for carbon monoxide, or pyrolytic ahdehydes, or whatever it is, can usually be overcome in time - given sufficient motivation.
Cigarettes are a carefully engineered product. They are engineered to be as addictive as possible without using illegal drugs. To beat them sometimes requires exceptional, expert mentoring.