I see it this way. The cop thought you had some type of drug device. If he approached you and it was actually something to do with drugs, chances are you'd take off. He simply followed his training and didn't allow you the option of running. Yes, he may have been a bit rough, but if you were in his shoes, are you going to give a suspect any chance of resisting or running, which would in turn put you and countless others in harms way? Now the officer may not have given you enough of a chance to explain what the device was, and that is where his youth and inexperience comes in to play. Consider how many times a cop hears things like Suspect-"That's not mine, man!" Cop-"But it was in your pocket!" Suspect-"I don't know how it got there, honest!" You don't really want to put a bad mark on his record for attempting to do his job. Instead, take the high road. Offer to educate the officers in the precinct in a twofold effort to A) stop this from happening again, and B) spreading the word as to the benefits of vaping. You might actually make a few friends on the police force... which is never a bad thing. What you don't want to do is complain, putting a bad mark on his record, and giving cops reason to dislike you and vapers in general.