Yes, you can inhale calories. This has been proven quite recently actually regarding the fad that is people vaporizing and inhaling alcohol to get drunk and avoid calories. It was shown that when the alcohol was absorbed into the blood it still metabolized and delivered calories to the cells, although far less than when ingested normally. In answer to your question though, there may be some calories coming from vaping but they would be extremely minimal plus they would most likely only come from sugars in the VG as most sweeteners are artificial or a chemical that replicates sweetness to the brains receptors meaning they have 0 calories. I cant gaurentee you that VG is or isn't absorbered into the blood or metabolizes in the blood but I can gaurentee you that even if it is, it is definatley not something you need to worry about. I also bodybuild and am very strict with my macros (daily calorie breakdown) and vaping has yet to affect my body compesition.