you are correct to a degree. Just look at Marijuana potency today compared to that in the 70s. ANYTHING is possible, but heroin getting any stronger doesn't really seem to be realistic. Coming from the suburbs of Chicago (Lake County , you can read about the 20 deaths), we were getting upwards of 80% purity. But who knows, meth seems to be as strong as it gets out in the desert.. some good stuff in Southern Illinois. On the other end of the spectrum... Take a look at Ecstasy pills. Being from Chicago I am blessed with these mints recently, but even when I started rolling in '06, my friends would rave about how much better they were in 2000-2001. To add to that, I was rolling with a friend (46 years of age), who used to get straight molly and great pressies. He said although the mints are the best in America right now, they do not compare to what was going around 20-25 years ago. PLUR everybody, have a great day.