Apparently, yes, there do seem to be effects.
You can take or leave them; question the validity and/or motivation of the sources, but...
http://www.ncbi.nlm.nih.gov/pubmed/18985799
Which is connected a bit more understandably...
http://en.wikipedia.org/wiki/Cannabinoid_receptor
...here: "in the liver, activation of the CB[SUB]1[/SUB] receptor is known to increase de novo lipogenesis."
Lipogenesis is the conversion of acetyl coenzyme A (no, I don't know what that is either, but it looks like it's derived when we're in aerobic mode from pyruvate, and people take that as a dietary supplement, so I make an assumption that pyruvate's typically ingested rather than synthesized, but I've not looked that far) into fats.
http://en.wikipedia.org/wiki/Lipogenesis
So, in any case, the pubmed study seems to suggest that, if you've already got a disorder which causes the irregular storage or conversion of fats in the liver, the presence of cannabinoids may exacerbate it. Up to that point though, it may actually just facilitate our conversion of certain fats/energy-stores. A fine line as always.
Anyone with a medical background, please, go ahead and put a finer points into or correct any gross misinterpretations of the sources I've included there.