My opinion would be something likeOriginally Posted by WorkingMann
this.
Here is a list of possible effects that can be used to determine if they work for you.
1)Bottle sniff
test
2)Arm sniff test
3) Self mood changes
4) Friends react differently with and without them
5) Reactions from
opposite sex including things like DIHL and nervous movement.
Of course my list has skipped all the details but
I'm sure you get the ideal.
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