First...Coke wont keep you up for five days...Now meth on the other hand???? I was a hard core Meth addict for ten years...Just quit two years ago...It's still common for me to think about bein high...meth grabs your soul and dont want to let go.....The thing about hard drugs is that no matter how much people around you care...they dont understand what it is to be an addict...(How can cindy spend her rent money on that shit)...an addict needs their fix the same as you need food and water...non addicts don't ever realy grasp that concept.....when you Quit your drug of choice for a long time...coke ..meth..pain meds..whatever...Falling off the wagon often leads to a quick spiral back to your old addiction......In your friends case you should act quickly and confront her about this...again quickly.....any comments from her like "I'm just doing a little, don't worry"...and it might be too late....that'll just be the bullshit she tells you to get you off her back....at that point an intervention from everyone you know that really cares about her would be prudent...again speed is of the essence...for her just knowing that people around her know what she is doing and that it is not acceptable might pull her back...help her to put the breaks on and say whoa WTF was I thinking getting into that shit again....however, she may be past that point...lying to get money...eyes dilated regularly...ultimately addiction is a fight within yourself...you cant really help an addict....you cant live in a rehab center forever...and forever is how long she'll be an addict.....confront her quickly before she go's over the cliff into a nosedive...Just my thoughts on the subject.