Hey Elizabeth, I don't know if I have any running at the moment, but I've done this before and never had a problem with triggered campaigns (even over the course of several weeks) receiving a 50/50 split. This is how we do a lot of our A/B testing since I hate that the results of Marketo's A/B tests disappear once you declare a winner. But, if you're concerned you could always run some tests with much shorter wait periods to sample how it would work. One thing to note here, depending on how often you let someone flow through the smart campaign (qualification rules on the schedule page), someone could get into the flow and be sitting in a wait step and then get into the flow again. I would advise setting the frequency that they are eligible to once every 10 days at a minimum.
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