[CoryG89]

I think your definitions are almost correct here. Addiction is actually defined as a medical condition ”characterized by compulsive engagement in rewarding stimuli despite adverse consequences". So addiction is technically a mental thing and susceptibility to it depends not just on the drug, but on the person, mentality, self control, etc. When a lot of people talk about addiction they are actually thinking of dependence, susceptibility to which is only dependent on the drug and the amount of use. You can have one, or the other, or both.

I believe that while both nicotine and opiates can be addictive from first use, it takes a much longer prolonged use of nicotine to form a strong physical dependence (from personal experience, on the order of a few years of regular use), unlike opiates which can form a strong physical dependence after just a short time (as little as just a few weeks of regular use).

https://en.m.wikipedia.org/wiki/Addiction