You only get a large vapour cloud when you are drawing liquid co2.
If you use a co2 marker, make sure its one that runs on co2 gas as opposed to liquid...
No you dont get any cloud with air!
If your after a Mag...or advice on geting a marker..what you after? what for and how much you looking to spend? How old? How serious about paintball..you know...havent got much else to do so we might as well see if we can sort you out!!