Please do not enter into a forum of public debate. The various activities to engage in you referenced did not share much in common, thus destroying your point.
LSD is created in a lab. It is not natural, and thus has the potential to cause severe harm to your body and mind. That is already different from weed.
My brother suffers from epilepsy, and once that began, which was actually late in his life after a severe injury, the doctor warned him that engaging in the use of any hallucinogens will likely trigger epileptic activity, and is extremely harmful to his neurological state.
The neurologist went on to make a joke at the expense of people like you, saying something along the lines of don't listen to the friend who thinks he knows more than he does about how it has some positive effect. Leave this to the medical professionals.
Sadly, I have a personal experience prior to when I was living with only my teammates once I was in the NCAA. When I was in prep school, my former roommate had been exceptional in both class and his endeavors outside of the classroom, and was well liked. He was one of my best friends, and he kept it to purely alcohol at the occasional party. Well, his second semester senior year he turned to LSD at the beginning of the semester because he was "curious". He began taking it on a weekly basis, and I have never seen such a drastic change in a human being in such a short period of time. He was depressed and constantly irritable when he wasn't high.
He eventually was put on suicide watch, and two years later was pulled over by a state trooper where they found a large quantity of various illegal drugs. Obviously, LSD being just one of them. For my roommate from prep school, LSD was the beginning of the end for him. He had a bright future, and I wish there was something I could have done to have stopped this from happening.