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I'm going to agree that it's quite possible that soma could simply mean just about any entheogenic/hallucinogenic plant.

However

There is also some hints of a trinity in soma, indicating a possibility that at least some versions contain three plants in combination.

My current theory is that soma is a combination of cannabis, opium, and ephedra.
Ephedra, of course, is "energizing".  For those who don't know, opium and cannabis combine to greatly amplify the hallucinogenic properties of cannabis.  
And, of course, cannabis can also be quite 'energizing' to the mind/thought.

To me it seems very likely that these three plants were soma.

I've found a lot of wisdom in the vedic and hindu texts and myths.  

And I've been known to say that hinduism is a not infrequent side effect of certain entheogens.  Of course, to be fair, it's a religion that clearly has some strong entheogenic roots.