I've always found that plants go through a few "phases" of smells as they mature. The first one I always detect is a kind of damp diaper/cauliflower smell. Then that phases into a kind of creosote/tar/petroleum smell at around 6-7 weeks. And finally, they begin to take on the final characteristics at around 10-12 weeks (or beyond)...which could include berries, vanilla, citrus, coffee, pine, etc. If you wait too long, though, the terpenes begin to fade.