I agree. I mean it's a bit of a twist in the plot here considering the parent was caught, but he is an adult. Be it for leisure or medicinal purposes, it may not really be a big deal. But like Rexual said, if he is however in visibly bad health, or possibly has an addictive personality, I'd probably want to ask another person in the house first and see what they said. Mom or sibling? Maybe they would know what's up.