Hong Kong International Airport is the only airport I've been to with multiple smoking lounges spread across the airport.
It was rated as the best airport in the world in 2007, and it's clear why.
Skytrax Top 10 Airports in the world for 2007
1. Hong Kong International Airport
2. Seoul Incheon Airport
2. Singapore Changi Airport
4. Munich Airport
5. Kuala Lumpur International Airport
6. Zurich Airport
7. Amsterdam Schiphol Airport
8. Vancouver International Airport
9. Kansai International Airport
10. Madrid Barajas Airport