Ive easily done over 100g of mephedrone in my time.The pre-ban China powder had little to no negative effects at all... If it did it was very temporary and wore off within a couple days. Nothing worst than any other stimulant though.The new crystal stuff that is coming out of India is pretty toxic and impure. I don't think its the mephedrone itself that is causing these effects in people but the impurities. I don't think it is washed well and still contains many chemicals used for production. I noticed weird neurological things that lasted days to a week after use. These too wore off though. The main concern is the vasoconstriction while you are on it. If it gets too bad it can cause necrosis. Pretty scary shit.Enelysion over at OVDB has a grip of the pre-ban China stuff. If you want to do it still, I would suggest getting it from him.The high is just fucking amazing though... NOTHING feels that good. Blows MDMA out of the water for me.