The Coby = Garp 2.0 are Smoker haters or they Smoke weed on indecent quantity.
If there is a Garp 2.0, that would be Smoker, ofc, no debatable.
The thing here is that there is no need of a Garp 2.0 and this only happened from end of East Blue Arc till end of Alabasta. The other situations where Smoker appeared aren't something like a Garp 2.0
I don't see Smoker doing something greater against Luffy for the rest of the manga, where, in what moment, etc? Luffy would win against Kaido now with Kidd and Law and the next arcs would be him defeating Admiral/Yonko alone already. Smoker has almost no development and he was relegated to Zoro/Sanji's tier since PH.