When i was still a teenager i experimented with some drugs because i found it quite fascinating how it could alter your consciousness. The first time i took XTC was the best moment of my life. I can't really describe it with words but damn that stuff makes you feel high. It's like you are very deeply in love with the whole world and you feel extreme euphoria at the same time. Take the most happy moment you ever had sober multiplied times 100 that also lasts for many hours. The feeling is so strong it's very uncomfortable at first because you feel like being shot at the speed of light into space. Then you're like damn, i want this to last forever. Nothing even matters at that moment, your mother could have died and you wouldn't even care. Because you are feeling a constant stream of extreme euphoria you never felt before.
If there is something like heaven on earth this is it. But it made me understand substance addiction better. I would for example never touch opiates in my life because you don't want to get hooked on something like that. That's true for most drugs except maybe marijuana which is not a big deal at all.
But still it's something i would recommend to do only once in your life, totally worth it for the experience.