theres no way he grabs ur head whenever ur high and stares into your eyes
thats way to obvious, he knows you smoke
just how after becoming a regular smoker you can tell when other people are high
now i wouldnt come out of the closet with it because maybe he just needs proof, something like finding ur stash or something
what i would do is try and find his stash first or catch him smoking then confront him on it, hopefully that would start a conversation going and you guys could work things out
just imagine this
you: dad i finished my hw, mind if i smoke a few bowls
dad: sure why not, wait for me ill join you!