when you are pulling hundreds of dollars every week out of creddit cards and driving an hour to get things. you feel sick and crazy with out it. you stop talking to people that don't do IT. but there's more...
When your use infringes on your work/school/relationship like your too fucked to go, do it at work or skip off to get high cos you "really need a line/hit" etc
And if youre ethier coming up or coming down most of the time then you might wanna cool it.