This vehicle was driving north bound on HWY 11 ahead of my vehicle in the right lane. I saw a cigarette thrown out of the window and sparks bounced across the road and into the ditch and grass on the right hand side. As I caught up to the vehicle I saw two men smoking (one in the drivers seat and one in the passengers seat). Shortly after the incident occurred they turned left onto HWY 50, exiting HWY 11. As it was dusk, I was unable to get an accurate description of their age. The driver seemed like a larger man with a baseball hat on and a beard.