Mack and Crack Fem One of the few strains independently verified with over 30% THC, Mack and Crack Fem is one of Seedstockers most potent strains EVER! It’s also remarkably consistent from one phenotype to the next – all have banging potency levels. Many users will find the buds are perhaps a little too strong. This strain suits only those that need the highest THC levels. The sweet citrus cookie taste and rich skunky undertones make this a real treat for the serious grower aiming to take quality levels higher than ever before.