man, everything ur body takes in grows out through ur hair, if u don't cut ur hair for 6 months, sum scientist guy could tell you what u were lacking as far as nutrients for the last 6 months, as well as every drug that ur body takes in for the last 6 months, cuz it's not the drug that gets u high, the drug makes ur body releaseother drugs that get u high, kinda like the first domino in a line