I have found 3 flavors which are strong enough to
vape zero w/o funky undertones.
Flavor West Menthol flavoring mixed w/ flavorless or to bam up many other juices. Can keep adding until sinuses are clear.
McCormick Cinnamon powder extracted w/ PGA for DIY flavoring. Can mix w/ flavorless and many juices to improve taste.
Above cinnamon mixed w/ Lorann Bavarian Creme. Tastes like rich sweet buttery cinnamon toast.
Taste is subjective but I think everyone would agree these flavors are intense.