Don't tolerate teen son's pot smoking

Protect him from his own lousy judgment and convey to him that you expect much more from him than to simply be honest about his poor choices. You expect him not to make these choices.

Smoking pot and drinking alcohol at 16 are illegal.

This fact may actually compensate for some of your weak parenting, but have you emphasized this?

Try to turn the page by saying, "Honey, you're not going to be smoking pot with your friends. And if you do, we will find you and drag you home. We'll call the police if we have to." Get a backbone. If you won't stand up for your own beliefs, how can you expect him to have the strength to do anything more than weakly manipulate you? Some parents resort to random drug testing their kids. While this may seem draconian, it can actually give kids an "out" when they're being tested by their peers.