Something I recently discovered that I like is called "Indian Warrior"...also known as Pedicularis Densiflora.
It's not as strong as weed and it's kind of different, but I was extremely surprised the first time I smoked it and almost thought maybe someone had put some THC in it and it used to be used be Native Americans.
It tastes really nice, has purple buds and kind of gives you a relaxing meditative type high and relaxes you.
It's kind of like weed without the mental high, just the physical effects...almost like an extremely mild opiate type effect...not really, but I'd say closer to that than weed.
It only lasts about an hour, but it's extremely cheap and legal so you can buy lots of it online.
Out of any purely legal smoke it is probably the most effective I've tried.
Again, it's not like weed, but it's pleasantly potent for something so unrecognized so you might want to check it out.