In my life i have had a few very powerfull psychedelic experiences with cannabis. I've discovered that under some circumstances, cannabis can be at least as powerfull as a large amount of LSD. There are however a few criteria. The first and most important one is that cannabis loses it psychedelic properties when it is used often. If you would want a powerfull cannabistrip, you would have to stay 'clean' for at least a month, and when you're a frequent user it would be much more then that. For very frequent users maybe even half a year. Secondly, cannabis can be incredibly powerfull when taken orally. When you smoke it, eventually less then a third of the cannabinoïds present enters the bloodstream. If you take on an empty stomach a large amount of cannabis, processed in a small amount of food wich is fatty, for instance a pancake or brownie, after staying abstinent for at least a month, you can have a very powerfull LSD-like experience. A bit more pleasant, because of the sedating qualities it also has. Besides, it combines very well with LSD for even a more powerfull experience.