Withdrawl means different things for different drugs.
For my drug it means irritability, headaches, and hunger.
There are ways to prevent it.
I could chew sunflower seeds or **** on a lollipop or ride a bike.
But I'd rather smoke.
I'd rather pick a half smoked cigarette out of an ashtray, lightly burn the end of the filter (to **** germs. Gotta keep it healthy.) and smoke it, than chew sunflower seeds.  
I'd rather jump out my window at two AM, walk two blocks, reach into the cab of a pickup and take a pack of cigarettes than **** on a lollipop.
I'd rather ditch school, say I'm too sick to go, stay home and smoke cigarettes and read a book all day, than ride a bike.
And I do.
And I do.
And I do.
Yes, I do.