Can you provide more details on how you started up your WSM? What vents were open and how much? What kind of wood pieces (chips, chunks, etc.)? Mine has never taken that long to get the thin blue smoke.
WSM 22 ~ WSM 18 ~ Maverick ET-732 ~ Flaming Fast Thermapen ~ Weber SS Performer ~ Weber 22 OTS ~ Weber 22 OTS ~ Weber 22 OTPlus ~ Weber 22 OTS ~ Weber Q300
When all else fails just ask yourself, WWGALD???