Why can't you get high on meth anymore?

You CAN get high on meth. Meth produces a euphoric stimulant high similar to cocaine. In other Words, it gives you an incredibly powerful rush of energy -- you can easily stay up for three days straight, or more -- and the indescribable sensation that the whole world is totally perfect and completely laid out at your feet.

That's why drugs like meth and cocaine and opiates are so addictive. No matter how horrible your life situation is, you feel AWESOME when you're high. For some people, it's the only happiness they can find. And it's incredibly hard to give that up and rebuild a life that they can get natural, drug-free happiness, or at least contentment, from.

So, you can indeed get high on meth. People wouldn't do it if you couldn't.