Like Scott said, if you're cleaning it and not detecting any off taste or other dispensing issues you're not going to get sick. The vinyl is going to get "stained" by the beer due to its nature.
But, if you're that worried about it beer line is cheap... go ahead and replace it. The few dollars could be worth your peace of mind.
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Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut.
Ernest Hemingway
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