@Ekfreet Doesn't look like an addiction here since he does seems to feel alright even without smoking. Pretty sure he is just used to smoke so he felt like smoking without the body really pushing him to.
@Ekfreet to be fair for him to retain his old memories he would also need neural connection so him retaining his neural connection on the need of smoking should be retained to.
@greatninja3 I was basing that on the assumption of this story revolving around a soul swap, or simply his soul entering a body that didn't have one any longer.
As for your suggestion, he would retain the memory of needing to smoke or 'feel' like smoking, but not 'wanting' to smoke.