Cannatonic is unique in that it is the first strain to reach a 1:1 ratio of thc-cbd. Some users prefer it for daytime use or to chill out with at dayâ€™s end. This unique hybrid strain was bred by Spanish seed bank Resin Seeds specifically for its low THC content and high CBD content. This was done by crossing a female MK Ultra with a famous G13 Haze male to create one of the premier strains. It has a slightly earthy aroma and a sweet, citrusy flavor.