My mindstate doesnt change from sitting next to someone drinking a beer.
The same doesnt go for a blunt.
Thats a matter of responsability though. It would affect a child to have to see there parent twisted off one.. Would you get contact high from being outside next to someone burning? probably not.. but if u want to sit shotgun in a car next to a blunt being burnt, and you dont want a contact high, then get the fuck out the car. really tho, there are substance's all over that affect us, legal, illegal, prescribed or otherwise... its all a matter of influencing yourself responsably.