You could say something along the lines of:
"Hey, Friend, what's so good about weed? Why are you always smoking it?"
If he's smoking it for medical purposes, then just drop it, but if it's illegal and he's doing it to "look cool", then I would further ask questions about it.
Parents often make the mistake that all their children have close personalities, but in truth, it is not so. For example one child may excel in sports while another boy in the family loves to read or draw and the same goes for the girls. [ There is always a leader of the pack (more than two children) and there will always be some discord, but if they are taught to communicate with each other and with their parents as far as what is right or wrong they will settle in and as they get older they will mature and most get along just fine even if they have their own individual personalities. Some families have a 'Panel' or 'Family Meeting' when there is too much discord and all sit down and discuss the problem and come to some agreement in a calm way. There should also be house rules and all the children should have chores to do around the house. ]
The media is what affecting teens
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In case of head injury keep the person still
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