Interestingly: Since I have been an ardent observer of breathing patterns because of Pranayama practices –I have not only observed but also read that there is a fair possibility of smoking being so addictive because it helps people breath in certain patterns! These patterns release stress instantaneously and thus soothe the smokers [The corroborative assertion being that the nicotine doses (supposedly the cause of addiction) given to smokers would not satiate them the way smoking does!]
This ‘outsider’ sense does work in amplifying the totality of gratification drawn from the process. However, this has not necessarily been correlated with degrees of introversion (extroversion) in my experience. Generally introverts or extreme personality types are ‘outsiders’, but not necessarily in case of smoking or other drug addictions. Even alcohol addicts have this ‘outsider’ complex and they make an ‘outsider cohort’. There has been a great deal of persuasive compelling from my colleagues in various stages of my life, to make me smoke or drink. It was not necessarily for making me feel the ‘ecstasy’ they were having. Not because they wanted me to have this rapturous sensation. Not necessarily as a scheme but perhaps because they found me an alien in their faction at times.
On the other hand though, smoking might act as a quick sedative, releasing stress (involving the breathing-patterns hypothesis), without creating much hubbub (when compared to the drinking which creates very tangible changes in disposition very quickly!). I mean, apart from complaints about bad smell of breath from your colleagues, you are not considered to be unable to carry out your responsibilities.
I have had discussions with many of my friends who are heavy drinkers and many of them have consistently maintained that they abhor smoking! They consider smoking much detestable than drinking to my astonishment! I have also observed that some of my friends enjoy smoke immensely when it’s accompanied with a drink, a coffee or a tea! [Lollipop in both of the hands!]