Day 3! Need words of wisdom.

I’ve been smoking a pack a day for most the past 40 years. I’ve tried to quit many times, and always went back. My health is suffering, I’m tried of wasting money and hate smelling like an ashtray. I really want to quit, but day 3 is hitting hard. I need to stay busy, but am too distracted to do much. Anyone have any hints for getting through this first week?