Here's a decent list of acceptable smoking woods from TVWBB. There are other lists out there on the web but this one is a good starting place.
http://virtualweberbullet.com/woods.html#appropriate
You will notice that walnut is listed as acceptable. Most folks will also tell you to go very easy on the amount you use as it imparts a strong smoke taste.
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Joe
Falcon MK V gaseous grill w/Grill Grates, OK Joe Longhorn w/ vertical - now gone, Char Griller Akorn, Camp Chef PG24SG, Weber 22" OTG w/SNS components
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