[sateesh]

Not OP, but this is one study I have came across, which postulates that cigarette addiction is quick to develop, and doesn't take years of smoking to develop. https://pubmed.ncbi.nlm.nih.gov/18444329/

From the abstract:

  New research has overturned the dogma that cigarette 
  addiction takes years to develop. Studies of adolescent 
  smokers show that symptoms of addiction, such as 
  withdrawal, craving for cigarettes and failed attempts at 
  quitting, can appear within the first weeks of smoking. 
  To account for these findings, scientists have developed 
  a new theory positing that the brain quickly develops 
  adaptations that counter the effects of nicotine. These 
  adaptations lead to withdrawal symptoms when the effects 
  of nicotine wear off. The results highlight the 
  importance of boosting government funding for antismoking 
  campaigns, particularly those aimed at youngsters.

The author of the paper (Joseph R.DiFranza, University of Massachusetts Medical School, Worcester, USA.) wrote in May-2008 issue of Scientific American https://www.scientificamerican.com/magazine/sa/2008/05-01/ outlining his research findings. The article Hooked from the first cigarette in this issue isn't available online, but if you are subscriber of SciAm checkout this issue.