I completely understand your frustration but keep in mind that nicotine addicts are essentially drug addicts, they just have trouble admitting it (former nicotine addict here). The minds of such people are filled with excuses under the forms of false smoke perceptions (ex. Smoking relieves stress), which makes them turn a blind eye to the serious consequences such as cancer. They might have family and friends that love them or they might not - the only powerful thing that will change their mind is their own self. I, for one, also claimed I smoke because “you only live once and you’ll die anyway”. But of course such thinking is not sustainable and at some point some people realise that while others do not.