^ What this man has said is spot on. I had a very heavy amphetamine habbit last year. I kind of got into it at weekends and before I knew it, my habbit had spiralled into 24/7 use, 5 week binges etc. Your body needs food and sleep, amphetamines prevent you eating or sleeping...It all becomes very counter productive in the end I can assure you!
Up here there is always strong speed. I've always assumed it was down to all the Polish, which I've been told by dealers is where they're getting it from. It's only really the poorly educated or shadey type people that will sell you the glucosey stuff round here. Seemed to be the best speed I've had has always come from people holding down alot of work and studying aswell. The young ones aren't really into speed as much as people who're a bit older and got lots of responsibilities and things that need doing. The majority of my speed dealers over the years were women!
I don't really believe in the loss in potency either A4B. I once did similar to what you've said above and couldn't really tell much difference. Sniffing it though you use less (higher bioavailability) and it is more rushy.
Prices round here vary from about 25 an eighth to £20 a g. Even the cheaper stuff is usually not bad speed though.
I do think of it as a dirty drug nowadays though and haven't been near it in well over 6 months.