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I use the timer feature all the time on my cell phone for a whole variety of things. Just found a free app in the Android Google Store that allows you to create, name, and set as many timers as you need. I generally don't time my smokes, but I just might start!
Al its still possible, I'm 56 and never owned a cellphone. Still use a rotary, wireless and an old Walton's style crank(incoming calls only). Although the timer feature does sound useful.