ye, this has happened to me before. I thought it was a lack of THC in the strain. I know that using nutes too late in flowering gives the plants a really chlorophyl like plant taste, maybe this is the reason for the smell (or lack of it) if you didn't flush or went on too late. This is just a guess so don't take it for certain, I could easily be wrong. Curing them for longer may bring out the smell more, is the smoke nice?