Heh. Maxx, Canadians still cross the border by the thousands every day for shopping. Gas and milk are two of the biggest deals. They are both a lot cheaper in the states.
Personally, I haven't been across the border in 18 years.
Willy, our border is referred to as the world's longest undefended border. Not completely true though. There's a lot of border crossings and most have secure entrances. I've heard that roads that aren't guarded have sensors and are patrolled pretty regularly. Not a whole lot of fences, from what I've heard. There's many thousands of miles of mountains and parries along the border, plus a few slightly large lakes.
Drug smuggling is pretty common. BC bud is pretty popular down south. I'm sure recent legalization in some US states hasn't made the import any less illegal. Nobody wants to rot in a US jail for bring a bag of weed across the border.