Warning:
My Joker's light had quit working again earlier. Just a few minutes ago I took a hit from it with the light not lighting, and after I released the button, it stayed fired up. I noticed the vapor coming out of the tip and took a draw to find it was still lit. I quickly unscrewed the atty and hit the button a few times then the light started working again and it powered off. Lesson learned, don't keep using it if it's not working properly!
Yeah, I would definitely contact whoever you purchased it from and get it sent in for repair as soon as you can. Bummer!