backfire in what way? The technicalities are different, but fundamentally both 3dcg and drawing train your aesthetic sensibilities and your ability to think three-dimensionally, in perspective, etc etc.
I think if I were to start from scratch, I would prefer to first become very proficient at drawing and painting before I got into 3D.
Many 3D beginners have absolutely zero sense of the artistically important things -- framing a shot & composition, using & controlling color & contrast, using perspective well, creating pleasing shapes/models, anatomy, etc etc. And the 3DCG community is way worse at helping beginners understand how important these things are than the rest of the art community -- you are encouraged here to care about what techniques to use for modelling, what software to use, ... just about anything that distracts from the truly important things.
E.g. /ic/ regularly has threads with anatomy, perspective, ... as main topics, but you barely ever see anybody talk about that kind of stuff in 3DCG communities.
That's also the reason it is commonly recommended to just draw with pencil and paper -- everything else is just another way to procrastinate and obscure the level of skill you really have right now (which is important to see both for you in order to understand how to improve and for others in order to critique you effectively.) What software you use doesn't matter, what process you use doesn't matter, ...
So if you want my recommendation, stay away from 3DCG for as long as possible until you really have the basics down. 3DCG will just distract you with an infinitude of technicalities from what's really important, and it's likely you'll give up before you get any good results.