I've read this thread with some interest for some time, but I've never bothered to sign up before to reply.
First a couple of observations. I honestly don't want to discount anyone's experiences here, but I am curious about all of the heart complaints. As far as I've been able to tell, this is the only forum where a significant number of heart complaints have cropped up, and they all seemed to have been preceded by heart warnings by a mod who had never taken the substance. That is very fair and useful, but I wonder why they seem so concentrated here. My experience with 4-MMC for the last nine months hasn't resulted in any of these problems, even when taken to excess (say ~5g in 6 days), and none of my friends have reported any of these problems either - about a dozen of us. One thing that I'm curious about is how many folks that have reported problems with 4-MMC have experience with methcathione or methamphetamine. Most or all of my friends do/ I wonder how much of these issues are more related to amphetamine type drugs in general, as at least personally (and my friends pretty much agree) I would rate the 4-MMC experience as distinctly like a stimulant (specifically very similar to methcathione) and not substantially similar to pure MDMA. At least I'd never suggest 4-MMC to someone asking for a MDMA type experience, I'd be more likely to suggest M1. though really I don't feel that either are really suitable comparisons. So have the folks complaining about heart issues or blood pressure been strong amphetamine users in the past, or are these complaints predominantly as compared to MDMA?
My other question is in regards to 4-MMC's look and burn. Now mostly I've had 4-MMC sourced from a non-typical source (asian bulk supplier, split among a fair number of us) but both times it's been bright white and very "fluffy" - very similar to evaporated and scraped methcathione. We did also source a much smaller amount from a retail supplier in the UK that was basically identical (same initial source?). We wonder though, as a number of folks have listed a crystalline off-white or tan substance as 4-MMC and frequently declared it "better". Is that anything close to a consensus? It's actually the reason we sourced the retail amount. Related, I've noted a number of people that described 4-MMC as not really having a burn. All of our 4-MMC has had a pretty hefty burn - not as strong as say pure methamphetamine, but pretty much stronger than anything else that I can think of. At least in terms of the burn resulting from the amount required to be taken - it is in fact the only drug that I've felt I nearly couldn't finish a line of, though that's always been after a long session, never at the beginning. Even at the start though I get watery eyes, etc when doing say two 100mg lines. Related to a recent post, that burn sticks around even after a couple of months of storage, or when left exposed to air overnight or such. Is it really true that folks are getting 4-MMC that doesn't burn really at all, or were those more or less outlying experiences?
Also, can anyone speak to vapourizing mephedrone, similar to methamphetamine? Is it in a chemical state that makes it suitable? Personally we've never tried it, if for no other reason than it would be a large amount to smoke. But I'm curious if anyone has any chemistry or anecdotes to relate, or of there is a necessary process to prepare it. I haven't seen much discussion of that as compared to say MDPV.
Thanks!
After leaving it spread out exposed to the air for a bit, the smell hasn't diminished and it definately stinks of coconuts. Bioassay of this material has led me to believe it may be cut, it is bulkier and less potent than my original sample from the previous supplier. 
