Sigh. Ok. OP seems to have dealt with this in a.sane and sensible manner. But... For the record, let's look at this a bit sensible my as opposed to "drag her to the police she will thank you for it later " brigade.
1)Pretty much the most dangerous drugs about in terms of consequences is Alcohol. I would far rather my children smoked a couple of joints or did a few whipits than got shitface drunk. (I would far rather they did none of the above, but I live in reality)
2)kids are going to be exposed to all sorts.of drugs if they have anything like a mixed social life. The best way to deal with it is to give them the information! There is no way we are ever going to be able to stop our kids being exposed to drugs. But we can give them the tools to make sensible decisions.
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If you drink, or smoke, expect any halfway intelligent teen to throw it back in your face as you're a drug user too.
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whipits aren't illegal, or even particularly dangerous. The police would really not give a shit.
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the most damaging thing about most drug use is the consequences of getting caught. Having a bit of a weed habit as a youth is far less damaging than having a criminal record that travels with you for the rest of your life.
Ignore hysterical responses, and for god's sake talk to them. Find out why they're doing drugs. Then, sit down with them and make sure they know all the consequences of what they're doing.
Read David Nutts " Drugs without the hot air" for a sensible and reasoned argument about drugs.
The sooner we as a society realise that chronic drug use is an illness, not a crime and that casual drug use is really not worth worrying about, the quicker we will fix a.shitload of problems.
For reference, see Holland and Portugal.
Rant over.