Can you explain in a "soft kind manner" to an addict that they should just quit? You can fight it pro-actively or re-actively. I prefer the former as, at least, prevents the addiction from even forming.
Please identify a smoker in your close circle and explain in a "soft manner" to them how that thing causes cancer, lowers life expectancy, increases heart rate and all the jazz that we are sure of - scary stuff. Report back if they quit.
I cannot be in total control and I do NOT want that but, at least, I'm not putting cigarettes on the table myself because that's what this is.