Smoker vs Vergo... Vergo was stronger.
Haki>Logia
Haki<Paramecia
Paramecia<Logia
Paramecia+Haki>Logia+Haki
The advantage of being a Logia is the fluid body, but Haki makes that useless.
Even if Smoker was fighting seriously, he would've been beaten because his DF was useless.