The smell of green is a good one. It means the buds are breaking down the chemicals in the plant, such as chlorophyl that gives it its green colour.

Also curing activates THC and makes the buds more potent.

You'll know when your buds are getting close to perfect, because the small bud leaves should be turning a greyish colour... Good shit!

4 weeks is normally perfect, but you can even do it longer.