I mean, if you ever went to a school book fair, how could you *not* have seen scratch and sniff stickers! 
 
We have 17 different styles in all the classic smells! Also, I don't know about you, but fireworks and camp fire are 100% *not* "bad" smells haha. 
 
Note that these are not strong smells at all. You really do have to scratch a lot for the smell to come out, so putting them in your journal or notebook will not make the whole book smell!