I have this friend who has had a taste for opiates and cannabis for quite a few years but recently suffered a pretty devastating loss and made the mistake of giving in and trying cocaine for the first time ever a few months ago. They don't use daily but close to it. This friend probably doesn't get super high quality stuff but doesn't usually complain. But they have noticed even during the first couple weeks of doing it that occasionally they will do a line (pretty small compared to alot of people) and while high will feel really anxious until the comedown.. no problems after and it doesn't happen every time, so my friend was wondering if maybe it's something that's been added to it that is causing the feeling? Or is it a side effect of the drug itself? Any help or advice would be appreciated. Thanks a bunch 