First of all, thank you for the kind comment. <3

And as for the how...
I like becoming my characters by drawing parallels between their reality and mine and trying my best to ultimately become one with them. If we look at this one for example; I used to play video games a lot, and I mean a lot. Not necessarily addicted, but just looked forward to getting home, slamming the door shut from the real world and play until as late as 4 am, only to wake up at 6.30 and go to school. So, in a sense, video games gave me what I believe many smokers get from smoking. Time off obligations, company, relaxation, ... ... I somewhat got the "same" sensation from video games that smokers do from smoking, so I can more easily relate to their "need" for a cigarette, and more easily understand what that cigarette means to them.
Some writing hokus pokus later, and you have a story written from the perspective of a smoker :P

In short, look through your own experience and draw whatever you can from them and transfer it into your character(s). Sometimes links are bizarre, and sometimes as easy as video games and smoking. :P
I'm sure you have it in you! ^^

Thanks for stopping by! :D