Nicotine has a big aide in addiction by being very ritually addictive, more so than any other drug probably. No doubt the compound itself is addictive, but a large part of why it's so hard to quit smoking when you've been doing it so long is it's a ritual you enjoy, and one you can practice many times a day (more times than you can safely inject, for sure) and in [an ever-diminishing] many locales.
I'm not really following your stance on the topic. I mean I understand what you are saying. But
I had a good 5 year habit with cigarettes, started when I was 14 too which often reinforces the addiction considering your brain is still developing. The most pleasurable part for me was the act of smoking (ritually), and I could practice this ritual many times a day - but that's only because there are 24 hours in a day, and my cigarette (smoking enjoyment) only lasted 15 minutes at the most. So there's plenty more hours left in the day after only 15 minutes. So naturally I smoke more for a more consistent ritual enjoyment through out the day.
Now a days with heroin, if I so choose to practice my well developed ritual on a daily basis, or whenever. I can do this once or twice a day on average.
"Wait a minute though, that means you're not practicing the IV ritual as much as you would a cigarette"
These type of rituals precede themselves in enjoyment.
My heroin ritual starts from the minute I park my car after buying a bag, through the injection phase, then continues to last until I am no longer high. Therefore these heroin rituals are much more potent forms of enjoyment, as opposed to my smoking enjoyment, which if I'd want to enjoy as much as a heroin ritual I would be smoking all day.
Considering this I don't see how your statement stands; as even just one exception breaks the rule.
Just because you practice 'the act of' more times with one thing doesn't mean it is a more addictive ritual, it just means it's a short and weak ritual.
Stronger reinforcement of an addictive ritual is not and should not be based on quantity, but also quality.