Yaoi manga

http://www.mangago.me/read-manga/trap_ootsuki_miu/
http://www.mangago.me/read-manga/choco_strawberry_vanilla/
http://www.mangago.me/read-manga/lover_boy_lezhin/
http://www.mangago.me/read-manga/ii_mon_waru_mon/
(by "smoking" u mean cigarettes right?)

http://www.mangago.me/read-manga/the_real_antismoking_campaign_manhwa/

Just say no :)

Here is one based around people smoking at work?
http://www.mangago.me/read-manga/datte_oishii_no_ga_warui/
Harada's

But on a more serious note, cigarette smoking seems to be quite a common theme in Japanese/Korean comics. Whereas elsewhere (in real life) it is frowned on to smoke in public, and banned in most confined spaced. Yet we see in some comics set in S,K/Japan people even smoking inside hospitals and offices!

Following

Another one about fag breaks ha
http://www.mangago.me/read-manga/tsujimura_san_is_a_secret/

http://www.mangago.me/read-manga/mijuku_na_karesh/

http://www.mangago.me/read-manga/sabita_yoru_demo_koi_wa_sasayaku/

Thank you guys ε=ε=(ノ≧∇≦)ノ