I'l begin by saying that meth psychosis is dangerous, also if you value your wellbeing do not even approach these people, the paranoia is nasty and they could be delusional and think you are trying to either rob them, take their meth; maybe they could think you were an under cover and do something hasty, these people are probably dangerous even to themselves, it is not a wise decision to attempt to resolve this face to face, the issue is that it is a public nuisance and you don't want it on your door step thats fine, but you aren't the person with the authority to resolve this, all you can do is make things worse if you approach them, so maybe speak to your landlord or other nebors or something and post a no smoking sign 10metres from building, they should tweak indoors. But my question for you is, how do hu even know their tweaking, you are making a hasty generalization about these people without sufficient reason, maybe install survailence, and get security to patrol. I wouldn't call the police unless things get worse it doesnt sound as if they are doing any harm thats more than just annoying, if you are bothered that much there is nothing from stopping you from up and moving to a new residence, you have the freedom. Ironically though, imo, so do they, maybe you should learn some relaxation techniques, it sounds like you may have a sleep disturbance. best RxAge