There are lots of different answers to this. It depends on the drug being taken, whether the person has taken it before, the person's body type (height and weight), whether the drug was just eaten/injected, and more. In general:

• Stimulants can make a person feel energetic, warm or overheated, and like they can't stop moving or talking. At the same time, they can make a person feel like they are completely out of control, as if they are having a panic or heart attack.

• Depressants can make a person feel mellow, calm, or even disconnected from the world. This also means that reaction time is much slower, so a person can feel, again, like they don't have control over their bodies. Someone who is depressed already can be made to feel completely hopeless by taking depressants.

• Hallucinogens can make a person feel and experience things that are not really there. While this appeals to some people, it can freak out other people--especially people who like to feel in control of stuff. People can also have what is called a "bad trip," where they don't understand what's going on and become really terrified--especially if no one is with them at the time.

The more someone uses a drug, the less effect it has on that person over time. That means that they need to take more of that drug to get the previous effect, which increases the amount of harm being done to that person's body.

As people keep taking drugs, they will likely see a negative effect on their sex lives. This is important, because far too many people try drugs because they think it will enhances their sex lives. But over time, it will become more difficult for a guy to get and keep an erection. It can lower sex drive in guys and girls. And it can affect a guy's or a girl's ability to reproduce once they are older and ready for that responsibility.

Once someone is addicted, everything becomes about that drug--if they aren't able to get some of it, they often feel angry, get headaches or the shakes, become irritable or nauseous, or feel like they are going to die.

Every decision is a balance between the pros and cons of doing something. That means every person has to weigh what they think are the potential good things of trying drugs with the potential bad things that can happen as a result.