I wanted to add my experiences with mephedrone to this thread. I have tried it a total of 3 times, and hope to try it many more times.
1. Placed approx 200mg in a capsule and swallowed.
Little to no effect. Possible that it was measured incorrectly, but I dont think so.
2. Snorted 200mg line.
Wow. Better than coke. Lasts longer. Little to no comedown. Repeated dosing had little to no effect. One thing to note, this was one of the only substances that I have gotten a considerable "rush" from snorting, including heroin and coke. With those substances, the come-up is slow, but with this it is almost immediate. Also, the second time I used it I had a much better experience than the first. No idea why, perhaps your body "gets used" to it, but the first time I used it was pretty mediocre, after that time it was amazing.
3. Injected approx 100mg.
This was stupid, as injecting RCs at all is never a good idea, especially considering the vasoconstrictive properties of Meph. Will not do again, but I figured I had to try it. Honestly? Little to no effect. Unsure why, as I was told by others that it had a similar effect to injecting coke or MDMA. Also, I was already high on Mephedrone at the time, which may have dulled or eliminated any impact the injection had. I repeat - I will not do that again.
Final Thoughts:
Snorting seems to be the best ROA. Effects are incredible, better than the best coke I have ever done, at prices lower than that for similar substances. If used in moderation, can be an amazing substance for recreation. Also, I dont seem to notice any of the "MDMA-like" effects that other users report. Moreover, "cold appendages" reported by others was not experienced. While a "morish" substance, repeated dosing didn't seem to keep me high. I will continue to use it, but consistent usage can create issues, I'm sure. I never experienced any increase in BP or chest pain, but I am a big guy with limits on how much I used. Using a gram or two of the stuff in one night could obviously create very real issues. In other words, just because this substance is in a legal grey area does not mean it is completely safe.
One other random thing. When I use other stims or opiates I usually want to smoke more than I usually do. On Meph, I get no such cravings.
Use with caution and have fun!