Despite the Zoro fanwank in this thread...I suppose I'll throw my opinion in to why Smoker>=Zoro
1) Zoro has never lost? I'm sorry he got schooled by Enel he was tossed to the side by Lucci and was slashed by Mihawk if you take that fact in Zoro has lost the exact same amount of times Smoker has so I don't see your point. Not to mention Zoro is protected by the biggest plot shield ever of a promise he made not to lose until he battle Mihawk.
2) Wow Zoro did one move he is clearly above Smoker, it's fair to say that was Zoro's strongest attack that we've seen and still it wasn't quite up to par with Law's room full power slash.
3) Pica is not practically the same level as Vergo at all he has no feats other than a rank...this is the guy who claimed he could take out admirals and everyone else on the island, so saying Pica = Vergo is a baseless assumption as just because someone has a position of an executive position it doesn't mean they are all the same strength.
4) Try using common sense the whole Smoker chasing Luffy is consistent throughout the series and is going to continue to happen so why on earth would Oda have Smoker weaker than the second strongest in the straw hat crew when Smoker is gunning for the captains head while Tashigi has also been shown throughout being the one to clash with Zoro.
5) Smoker has only battled people stronger than Zoro since the start of the New World so trying to put Zoro ahead of Smoker at this moment of time is ridiculous. Until Zoro starts fighting high tiers like Vergo, Law or Doflamingo you can't put him on the same level as Smoker he simply hasn't shown enough on strong enough opponents.
6) Smoker is the Marine that's always rivaled Luffy in terms of strength when it comes to the two fighting and Luffy himself says it would be fun to fight Smoker at his full power indicating that Smoker is around the same level as Luffy since he would be a challenge for Luffy.
The fighting levels in my opinion goes a little like this.
Law=>Luffy=>Smoker=>Zoro>(Not by much)Sanji.
No one is underestimating smoker bro...I just cant see how you think Smoker is stronger than Zoro ...when this chapter Zoro basically fodderized Doffys top executive and Smoker couldnt even beat Vergo .
Actually Smoker is probably the most underestimated character at this moment in time...
Not to mention there's no proof at all that Pica is stronger or even remotely similar in power to Vergo...again a top executive position doesn't mean they are all the same strength. Also there's no proof Zoro could beat Vergo since it took slicing a Mountain and then some in half to beat him...while Zoro's strongest attack didn't cut Pica in half.