Of course I would, but theres some important things to consider:

First off, I hope we all realize what a large majority of stoners/hippies/potheads existed in our parents generation. Meaning, there is an extremely good possibility that your father smoked more than you do, as well as did more coke and acid than you ever dreamed..

Second, I imagine having a wife who is going to be against our child smoking marijuana. Since if you ever asked around, way more women would vote against their child smoking, while many men would be fine with it. Once you understand the power women have on us, you can understand why most fathers must go along with the wifes consensus on the issue.

So while I can see myself not caring about my son smoking, something tells me that I will become like all fathers and pretent to care about it, but really just do it so he understands the importance of the aspect of "not getting caught".