INCARNIBUS

Quite a bit of manhwa has one of the mcs be a smoker so I’m sure u can find smth just by clicking randomly lol. The first two examine it much more thoroughly and focus on it quite a lot, they’re also by the same author if that helps. For the second ig it’s more backstory but it does intersect with the plot a bit.

Alcoholism:
https://www.mangago.zone/read-manga/private_scandal/

Drugs iirc:
https://www.mangago.zone/read-manga/obedient_heritage/

Alcoholism and smoking:
https://www.mangago.zone/read-manga/sangyang_the_wanderer/

Smoking specifically in the side stories
https://www.mangago.zone/read-manga/bj_alex/

Smoking
https://www.mangago.zone/read-manga/pink_heart_jam/

Alcoholism if u rly wanna read jinx tho ig
https://www.mangago.zone/read-manga/jinx/

Title says it all
https://www.mangago.zone/read-manga/liquor_cigarette/

I haven’t read this in a while but I swear there was smth about smoking/drugs? Someone correct me if I’m wrong
https://www.mangago.zone/read-manga/cloud_1/

Thank you sm omg

Darkness Before The Dawn

The main characters arent addicted but rather one of them makes and supplies drugs in hong kong slums. One of my fav stories and its pretty unknown. Lmk if u enjoy (๑•ㅂ•)و✧

Moon of the devil world
Campus secret girlfriend

https://www.mangago.zone/read-manga/plaything/ a lot of story from the same author have the same tropes too

I’m reading moon of the devil world rn and it’s so good