Old Smough? I don't know of this boss.
Do you mean Covetous Demon?
I thought of the fat guy in Heide's Tower of Flame as Smough, mainly because I forgot what Smough looked like over the years and only remembered Ornstein. Covetous Demon was possibly the easiest fight in the game; all you have to do is walk at a fast trot in crooked circles, roll forward when he does anything, then turn around and get some hits in. Snake Spear Woman was second-easiest, since all you had to do was circle and block, then roll with a very forgiving window when she winds up spell spam.
Dark Souls 2 has some of the shittiest boss fights on average, only rivaled by Demons Souls. It's not you
Blaine, it's the game.
They seem to vacillate between extremely easy and obnoxiously difficult. Just look at the telegraphing on Old Iron King. How anyone could miss a dodge on that guy is beyond me. Seeing where his flame breath will begin clearly takes a cool head and slightly fast reflexes, though.
I vanquished The Rotten and will head to Old Iron King soon, but for now I've headed back to that misty forest and explored to find more of the stuff there. I heard through the grapevine that there was a really nice caster item in the center, but I watched one of the invisible phantoms respawn in front of my face near the center and decided, yeah nah, I'm just going to continue on to the next bonfire.
Yet another lovely design decision made specifically with Sorcerers not in mind: agile phantoms who can't be targeted. I reached the next bonfire and realized that this area, too, is full of untargetable sons of bitches. Back to meleeing everything, and it's hard as shit to completely avoid their damage since you can't target them, can't see what they're doing very well, and they'll guard break instantaneously given even the slightest chance. Also, they have good Poise compared to many fodder enemies. Fortunately, it's not too bad. Usually they can stick me once or twice before I finish them off.
Area's also full of petrified locked doors that I don't quite have enough fragrant key branches to open. Chances are they have melee weapons in them anyway, which is yet another issue with playing a Sorcerer. Fully 80%+ of loot isn't a staff (or even a chime), isn't a spell, and isn't robes. It's a huge procession of melee weapons, armor, and various shields.