Smoke her stuff in front of her and say, "Thanks! when you gettin' more?" 
He asked what HE should do, not what WE would do.
weed leads to worse drugs in my opinion, friend of mine started with weed then he got up to meth and crack by the time he graduated, haven't talked to him since the last time he offered me meth
I was a freshman at the time
My humble personal opinion: meth is the worst drug on the face of this earth. I've had friends come back from bad heroin and cocaine addictions (most with help) but never Meth, it destroyed them.
It isn't chemically addictive, but any behavior repeated often enough can become habitually addictive. That isn't to say it doesn't have side effects, but chemical addiction isn't one of them.
This. It can become a bad habit/behavior like most "enjoyable" things taken too much. Maybe the most relatable example for you and the wifey is the morning cup of coffee (yeah, I know, hope it hasn't been overplayed to your ears on this matter, yet. But bear with me please.)... I'm serious, look at your behaviours related every morning around it (or in other cases, the excuses you're creating for your own behaviors or demanded sustenance when in lack of). Good behavior and responsible use you'll take one every morning and get by. Take too much of it, or take none at all after being used to it for so long... and well, I wouldn't want to cross your path in the morning, likely. I'm sure you got the will power and mental integrity to never drink another cup of coffee for the rest of your life... but because of the habit and dependence on it that you've built over so long, why would we want to subject yourself (and ourselves) to such displeasantries?...
will every morning without coffee now for your lifetime be viewed by you now as a displeasantry?... see what I'm saying now? A bad and arguably unnecessary dependency....
You're wife is right to be concerned if overindulgences or bad habits are being suspected of forming.... if your daughter knows better though and is disciplined enough (in particular, lets hypothesis that she's also disciplined/smart enough to wait another two-years until she's responsible for herself and her own actions) I think she'll be just fine.
Pot, in a nutshell, makes most people comfy and depressed. It's a downer. For a young teenager, like your daughter, if she starts to slip and isn't disciplined enough to catch it and keep her priorities and responsibilities in place, she will keep slipping and "the struggle to achieve" and overcome that additionally introduced depression will be nothing but a burden for her that she won't need.
She'll be good if she knows that smoking pot on an already bad day will most likely not make it any better and do nothing to resolve a situation or problem, then she will be be less likely to keep smoking more and increasing her depressed mood level and, in essence, make a bad day worse. She'll be good if she knows that spending money on pot when you barely have enough money to spend on food won't make you less hungry. As simple and basic sensed as those concepts may seem to us adults, with teenagers you never can be too sure.... 16 =/= 18+.
Edit: Spellchecker is your friend.
