How, specifically, are your friends and family "injured parties" from another person choosing to smoke cannabis? What car wreak? 
Malum in se offense requires a injured party other than oneself. >>
My friends' families are the injured parties. Not to mention the other person killed in the car wreck.
You could make the same argument against the car... It only takes a moment of inattention and terrible damage can be done.
How, specifically, are your friends and family "injured parties" from another person choosing to smoke cannabis? What car wreak?