GFK is a fantastic strain for nausea. I had a pheno I was running for a few years that smelled like burnt rubber when trimming. Smell goes to Grapefruit with the burnt rubber being in the background. Yielded about 3 ounces per in a 4x4 under a 600w light in soil with organics. Tasted like earthy grapefruit. Have about 3 ounces left then that pheno is gone sadly as I had to shut down. Got my seed as a freebie from attitude when they first started selling Emerald Triangle seeds, got lucky and got the best plant I've ever grown and kept it around for my health issues. Right up there with any "top shelf" strain I've ever tried.