8 week now but my plant smell is weak is it a prob...

You've got a long way to go by those buds, probably not even pushing smells yet. That being said, things to increase the terpene products are in-line with quality flower production, it is about keeping those terpenes. Harvesting at the proper time preserves those terpenes as well as, and most importantly, drying conditions. The conditions and rate at which you dry your cannabis directly affects his taste/smell, too fast and you get hay, too slow and you get mildew/mold/. I prefer to dry at 68f and 50-60RH. I then will put them into jars with 62% RH Boveda packs and you are on your way to great taste. If you've dried it properly, cure it till it tastes good.

All strains are different. Some don't start smelling heavy till last 2 weeks of flower as some smell in Veg.