There are plenty of drugs and chemical agents that will do this. However, as a physician, it would not be ethical to list specific drugs or doses which could be used for this purpose.
it depends on the drugs used. Most man-made drugs such as cocaine and heroin can easily cause death from an overdose. Other drugs such as marijuana cannot kill you. so basically, yes SOME drugs can...
every single drug does. besides marijuana, that just causes short term memory loss while you are under the influence of it. technically its a herb. why do you think its beginning to be widely used...