I just go for a little stroll outside and the smell goes away pretty fast. The smell from ganja is strong, but it really won't stay on you for too long. If you eat anything, the smell will leave your breath and if you wash your hands after smoking a joint or blunt, they shouldn't smell too badly like weed. I think as long as you don't get too paranoid you'll be fine, the smell is strong but it fades rather quickly.