If a bear smells something he might like to eat at your camping spot, he'll likely come investigate it. If he doesn't smell your camping spot he may wander by it, if he just smells you he'll likely not want to stick around. Make your camping spot smell like fresh cooked bacon and you will invite visitors. No good smells, no good reason for visitors to stick around.
In short, bears have no desire to be around humans unless being there presents itself as and easy and quick meal. Bears like easy meals.