I'm sure I can name a few metal/prog metal bands which will spin a few heads when you're smoking.
Cynic
Gordian Knot(These are said to be Progressive Metal, but they seem to have taken it to a whole new level, it's great musicianship but I really don't think we should call it Metal... Lol)
The Faceless
Dying Fetus
Beneath The Massacre
Nile
Cryptopsy
Decrepit Birth
Decapitated
Death
Bloodbath
Necrophagist
The Red Chord
Dawn of Demise
Gorerotted
Sleep Terror
Mastodon
Cannabal Corpse(Cannabis Corpse are pretty funny too!)
I'm not really a fan of the old school Metal though, stuff like Judas Priest and Megadeth, I just couldn't bring myself to like them, perhaps it's the recording quality? I find myself not really listening to the early Dying Fetus stuff because it's low quality recording.
Black Sabbath seem to be one of the only exceptions. However, I do like Classic Rock too, such as Cream, Uriah Heap, etc.
I also tend to find myself hating a lot of Metal that is released these days. Especially genre's like Deathcore, Nu-Metal, Screamo, Emo, etc... It's all just about making a fashion statement... They all have high budget music video's with sparkling outfits and spiky hair and airbrushed skin(see Machine Head - From This Day video or Spineshank - Synthetic) and bands like Bring Me The Horizon and that fucking knob head Ollie Sykes, what an absolute bellend he is and if I could punch him in the face in front of 500 people on a stage again, I'd jump at the chance.