I don't have an opinion myself Profalis but click on "Search" at the top right list of links on this page and try weed or marijuana and you should get a lot of opinions on what people experienced.
Drugs can create or intensify spiritual experiences temporarily, but they do nothing for, or in some cases even obstruct, the cultivation of ecstatic conductivity and carefully paced spiritual practices.
That said, it's not the end of the world either! I know that there are some AYP'ers out there who smoke the odd bit of weed, and I have done myself, but I didn't find it helpful in any way.
My belief is that if you have to ask, you probably shouldn't.
For me, there is some benefit to moderate use of marijuana during certain stages of purification. I know others who find the same. I also know of many people for whom using marijuana would be nothing short of devastating. So... my answer would be that you probably know what is best for you.