scientific articles don't really have any info accept for amphetamine studies from the states but those are way lower consumption figures yet the advantages are prevalent in students with regards to their studies and tests.
methamphetamine and methcathinone are quite similar in chemical composition and manufacture process.
methamphetamine is a bit more complex - to compare: cooking up cat vs meth, is a little like frying chicken wings, vs roasting a chicken.
both affect receptors in the brain in a similar manner
both tend to cause "insular" behavior - this may be a reason some students gain benefit (insular behavior + extended waking hours).
and yes, over the years - specifically between 2000 and 2005 i did heaps of schit, cat, coke, meth, ghb, ketamine, heroin (by mistake) - along with the other pedestrian narcotics of the day - the weed, acid, mdma, etc
cooking up a batch of cat and ghb on a wednesday night for the weekend was a regular activity (cat has an amazing nutty almond smell (an ester) halfway through the process & ghb is as simple as cool-aid
You think you can manage and suddenly you loose control.
This is a road you do not want to be on. Its a road to nowhere. And that road will be your end. The problem is on your way to nowhere be ready to loose everything close to you.
I am guessing you at a point where it is so addictive that you want to keep taking it which keeps you awake for a week. The only positive I can take from this is you realize there is an issue and hopefully it will lead to a realization that long term health effects should not be your concern right now and rather cutting your dosage and a serious attempt to come off it
This stuff is so addictive - I've seen it tear a family apart and there's no happy endings when this shite is involved.
Also, how do you know its not cut with nasty things like rattex or drain cleaner etc?
You seem like an sensible enough person to know that what you're doing is damaging your body/brain etc, even if there's no noticeable side effects.... yet. From what I have been told by friends and such is that the only benefit to doing a drug like this is to be a social butterfly if you're more of an introvert or to get things done - specifically my varsity friends who need to grind non-stop in order to get a project done or deadline met.
What are your reasons? As so many other have already asked - maybe if you it helps you get stuff done and work harder try something like Conserta, or even better a natural option like Concentrate? If it's just for fun then you need to try seek professional help and maybe involve someone close to you you can trust and get support from.
Main thing is, the drug isn't adding to your life only taking away from it - hopefully you can nip it in the butt before it takes more from you than you expect.
I think you already know that the effects are not good, so what would be helpful about knowing the specifics?
You want to know what to look out for when you begin to feel (the probably inevitable) negative side effects if you continue as you are?
You already feel some general negative effects and aren't sure if they are related to the drug use?
You already have some specific negative effects and want to know if they are permanent?
Surely no matter what answers you receive the only thing that makes any sense at all is to stop doing this to yourself?