The sooner you quit, the sooner you get better. Stop. No drugs. No classes. Stop. Take control. Get better. No excuses.
30 years ago, I decided I couldn't breathe for exercise if I smoked. I stopped.
About five years after that I started a 20 year snuff habit. I was heavily addicted. One day, my bp was high and I felt icky. I put the chew can in my desk drawer. I stopped. That chew can sat there for three years.
Snuff addiction is deeper than cigarettes, and it's a delivery system with longer, and higher, levels of nicotine.
You have to tell yourself that the sooner you quit, the sooner you'll be better.
You deal with a lessening addiction. You stop. You assert yourself. You win.
Understand, nicotine, is both stimulating and sedating. It allows you to go without eating, and that nicotine changes the way your respond to blood sugar levels. Understanding those facts will help you to minimize the urge to reengage in smoking. The social urges will take a bit more will power to overcome..say, like, when you're drinking, but, just don't stop. Pretty soon, a day becomes a week; a week becomes a month; a month becomes six months; six months becomes a year; a year becomes two years...one day at a time at first.
My mom's friends died from lung cancer. Mom died from COPD. She was on an oxygen machine the last two years of her life. When even that wasn't enough, her sister held her hand and she passed on.
Stop smoking for yourself, and those you love, and that love you. The urge is petty compared to the hurt.