I know that g13 is 27.7% thc but I would agree with some of you guys you really couldnt say a certain strain is the worlds strongest because even though lets say g13 is known to have 27.7% if some fucking idiot who didnt know how to grow for shit had g13 cuttings dosent mean that it is going to turn out to be the full 27.7% for that guy so if the idiot had the g13 and another guy who has a greenthumb happens to have a strain thats not that good and is known to only have 18% thc in it, even ttthough it is a weaker strain the greenthumb could most likely grow that strain and have it turn out more potent then the idiots g13. So I would say that is a question with no true answer but good question 2 ask its neart to hear everyones answer