Within about 10 seconds, the bloodstream carries a stimulant  called nicotine to the brain, triggering the release of dopamine  and other neurotransmitters including endorphins that create the pleasurable sensations  which make smoking highly addictive.
En uns 10 segons, el flux sanguini transporta al cervell un estimulant anomenat nicotina, que provoca l'alliberament de dopamina i altres neurotransmissors com les endorfines, que creen sensacions de plaer i fan que fumar sigui tan addictiu.