PS Japanese Jo Jutsu (short stick) training usually found in conjunction with Aikido or Jujutsu schools takes quite a while to become proficient but once you understand the principles it is quite effective
true here, but aikido is a sword form in true form. Each move can be done with a jo or yourself.
But, as the man said, it can be very effective when you are diligent about training.
I carry a jo when i go walking, and have been stopped by police many times. Check your local areas about carrying one. just because you say i is a walking stick, doesnt mean they cannot book you for a weapon.