I never started smoking because i weighed the pros and cons.
PRO - NONE
CON - Health, Smell, Appearance, Parents Kicking Me Out of the House
Seriously, i dated a girl who smoked and it was like kissing an ashtray. It was GROSS.
When you quit. Take that money and have it automatically subtracted from your bank account into a high interest savings account. You could have a nice retirement fund, take a nice vacation, pay for your kids to go to college. You can do amazing things with it.