I've only experienced a few, but my favorites are weed, opiates, hydro is the only I've tried, and the nice coke I get.
You should start a garden. There's hundreds of fun plants you can grow, and then choose to consume or not to consume whenever you please. Many are legal or unknown enough to be legal, and have more "spiritual" effects than getting "fucked up" And plants are awesome, period.
My sister's looking into doing that, though she needs to get a settled adress first. A writer called John Burnside mentions attempting to combat (or possibly augment) his alcoholism by cultivating various botanicals in his excellent autobiography "Waking Up In Toytown". Mind you, I would mess with this Angel's Trumpet shit http://news.sky.com/skynews/Home/Sky-News-Archive/Article/200806412802237 Poor guy, only 18 and he's ruined himself.