Amphetamines.

mphetamines can cause appetite and can stimulate your respiration. If you take a dose of 10-15mg orally, as in by pill, it makes you form more mentally and makes you more alert and just physically more active. People have not yet to figure out if it increases your work ethic or if it decreases your work ethic.

Some bad stuff about the drug are it can raise your bloodpressure and make your heartbeat lessen. You can also inject the drug and I guess that goes to your blood system faster so the drug kicks in faster as well. When the weathers hot it's more likely to put your body through bad symptoms of the drug, like the high bloodpressure and heart rate and just bad stuff for your body. They also raise your body tempture too, which is no good. So overall this kind of drug could be the worse, because it just messes up your respiratory system, and you kinda need that.