Yes you can understand smoking!

French version:
Cours gratuit express: Tabac fumé = Nico + Goudrons

Nico = Addiction (Cerveau), l'addiction n'est pas mortelle.
Goudrons = Cancers (partout depuis la bouche jusqu'aux alvéoles du poumon et AUX EMONCTOIRES DES GOUDRONS, sang, vessie, rein, tissu gras par ex sein...), les cancers sont potentiellement mortels.
Donc
Sniffez mâchez ou à la rigueur dépensez plus pour inhaler de la nico sans goudrons (e-cig).

English version:
Free express course
Smoking tobacco = Nico + tars

Nico = addiction (a hook in your brain), addiction is not deadly.
Tars = cancers ( everywhere tars are in contact with cells and DNA, id est from mouth to lung via air and via blood, kidney, bladder and fat deposit like in breast...). Cancer is potentially fatal.

So go sniffing chewing to avoid tars and cancers!
If you ask yourself how to spend my money buy an e-cigarette...
Then you will have nico without tars.