I looked and looked at the laws that I could find on the Idaho Government website but it didn't have a clear answer so I called the Boise Police Department and Officer Cooper was kind enough to talk me through it a bit more.
Here in Idaho, earlier today, The House Health and Welfare Committee approved a measure to bring Idaho up to that standard to match the federal smoking age. Most Idaho stores are already following the federal law and only selling smoking products to individuals over the age of 21.
You know how you hear that every state has there silly laws. Laws that no one really thinks about much, but when you find out they exist you tend to be a bit surprised. Yeah, I'm in that boat. After some searching around on the internet I found that Idaho has a pretty peculiar law that I wasn't aware of .