So last weekend swim and a couple of mates bought 4 g's of Mandy and we did a gram on the night and saved the rest. Firstly one of swim's friends (T) has done Mandy with swim before but swim's other friend (S) has never done anything but weed which is a different story. So anyways swim and his mates all did some lines and swim and T started to feel buzzing and were pinging in no time but T did not feel anything but a raised heart rate swim and his mates finished a gram at which swim and T were off their nut but S was still sober ??? Why did S not get high is he immune to Mandy and this was defiantly good Mandy as swim and T got high any explanations because S really wants to get high !