From the horse's mouth.
Quote:
From the Wyeast FAQ website:
3. Does the package need to be fully swollen before pitching?
No, The package can be pitched before activating, or at anytime during the activation process. The activation process "jump starts" the culture's metabolism, minimizing the lag phase.
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You don't even really have to smack if you don't want to if you are making a starter, but you definitely don't need to wait for it to inflate. Since you didn't make a starter, you will probably have a longer lag, regardless of whether or not the packet expanded.