It's normal to try recreational drugs because people are curious. Most people who use drugs for fun grow out of it. Some keep doing it every once in awhile while others get hooked. I don't know why some people get addicted but I do know that it's easier for someone with money to become an addict than somebody earning a middle class wage because drugs are expensive.
The problem with young people under 25 and weak people is that they might not get a second chance. They overdose and die. That's why even experimenting can be dangerous.
Marijuana affects short-term memory, impairs the ability to concentrate, inhibits alertness and reaction time making driving dangerous.
Cocaine boosts the heart rate while constricting the blood vessels, increasing your chances of having a heart attack or an abnormal heart rhythm.Crack, cocaine can be smoked.