Ah.. thanks Feldon.
Yes, ingesting any gas molecules smaller than O2 is theoretically dangerous.. depends on how much you ingest though. Divers have to watch their Nitrogen retention for the same reason. Helium acts faster though - smaller molecules. In any case, as long as its done within limits, the body gets rid of it over a period of time.
In small quantities though, it shouldn't have an effect. Thing to test would be, if you use helium to push out the beer, how much of it ends up dissolving?
You see, CO2 remains in the beer/soft drinks because it is actually heavier than both O2 & N2. Helium on the other hand, is extremely light. 'IF' it did dissolve, I'd expect it to escape out super quick. But I'm not expecting it to dissolve (much at all) if the beer was pre-carbonated. This is something that can be safely verified by experiment. Imagine mixing oil and water in a bottle and then lid it and leave it alone for a while, the lighter oil would form a layer on top of the water.... Similar concept.
My real concern was what you pointed out about ingesting Helium along with alcohol. I couldn't find anything on that and am actually concerned about that.