
Quick answer — Mahito Ooba voices Smoker in ONE PIECE, Ernest Mecklinger in Legend of the Galactic Heroes: Die Neue These, Big Pan in One Piece: Adventure of Nebulandia and 2 more characters.
Mahito Ooba voices Smoker (ONE PIECE), Ernest Mecklinger (Legend of the Galactic Heroes: Die Neue These), Big Pan (One Piece: Adventure of Nebulandia), Akio Kurosawa (Witch Hunter ROBIN), MC (One Piece: Django's Dance Carnival).
Smoker is voiced in Japanese by Mahito Ooba.