Question Summary:
It is Makrooh to sell smoke pipes

Question Detail:

I run a business as a Muslim am i allowed to sell smoke pipes for smoking.

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
It is Makrooh to sell smoke pipes ^[1].
And Allah Ta’āla Knows Best
Bilal Ishaq (Issak)
Student Darul Iftaa
Leicester, England, UK
Checked and Approved by,
Mufti Ebrahim Desai.
[1] Fatawa Mahmudiyyah V 27, pages 230, 234, 246, 247, 248
     Fatawa Darul-Uloom Zakariyya V 5, page 134, 144