walaikum assalam
interesting sawal
i think dono main kaafi difference hai, addiction woh hai jo cheez hamare dil-o-dimagh pe sawar ho jaye aur jis ko chorna (quit karna) mushkil ho jaata hai. addiction k side effects b hain k agar insaan us cheez ko chor de tou us k asraat us k dimagh pe begative ho sakte hain, mean he/she might become distressful etc..... addiction main insaan apni life ka control kho deta hai, n they have to follow their such habbits which they are addicted to even though if they hate them or don't like them anymore.....
Passion is totally different, Passion mean kisi cheez ki lagan ya jo cheez insaan apni marzi , joy aur khushi k liye karta hai. passion main woh apne saare powers use karte hain e.g. to get sumthing is sumone's desire (passion) so he/she will put all of his efforts to get wat they want....passion main insaan agar samjhay b k woh is cheez k baghair nai rahe ga, but sumhow woh us cheez k baghair reh lenge coz they are not addicted to it.....
for example: a person who smokes knows smoking is harmful for his health, but still he smokes coz he is addicted to it.
yahan pe ek cheez aati hai k addiction main if u won't like or do not want sumthing, still u will have to do it or stay linked with that thing coz you have no other way or u might think if i quit this thing, it will hv a negative impact on me. however, passion main esa kuch nai, is main agar insaan ki desire na poori hon tou they can find any other way to meer their desires....
lekin kahin na kahin ye dono aapis main milte hain, like passion can become addiction agar koi cheez had se ziyada follow ki jaa rahi hai tou......