Breaking up is hard to do? NOT.

Q1: What are the normal reactions of the body while quitting smoking?
A. The normal reactions are:
• difficulty in concentrating
• dizziness (because the brain needs to get used to having more oxygen)
• cough and runny nose (as the lungs get rid of all the toxins collected inside during smoking)
• strong craving for cigarettes for about two weeks (while the body gets rid of the nicotine)
• tingling sensations in the arms and legs (as blood circulation returns to normal)

However, not every smoker trying to quit will experience these reactions. A smoker who experiences these symptoms should not lose heart as they will usually disappear within one or two weeks.

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Everything is hard to do absent the character to do it. Anybody who can't quit smoking? Bah. (Try giving up sex.)
What is lacking is the real understanding of what is going to happen. The pain, the cancer, the destruction and cost to your family and friends, and the $ cost to society. Drive that home.
Probably just as easy, maybe more so: advertising that shows smoking as disgusting. "Involuntary" signs of disgust, as opposed to long winded lectures on disgust would be communicated much more easily. A cough one tries to suppress out of politeness. A quick ending of a conversation. Making a polite detour around a smoker.
"Oh, I don't mean to offend you by moving away. It's just that I find smoking to be disgusting, and I can't help it. I'm really sorry."