biological model states that addiction is illness and therefore its a problem within the person that can be cured.
initation- drugs cause high levels of dopamine which pass through mesolimbic system and users feel immense pleasure from this.
BLUM ET AL- believes people are pre-dispostion for addiction if they have the A1 variant of DRD2 gene which makes you have a definiecy of dopamine receptor cells and make you more vulnerable to addiction and mesolimbic system
maintenance- regular use of drugs causes natural reduction in dopamine receptors in order to adapt. Which causes stress situation with addict and withdrawal symptoms. the negative state becomes a driving force in craving the drug, so…