I was recently told that May 31 is World No Tobacco Day. Of course, in my world, every day is no tobacco day and the best day to quit smoking is today. Quitting smoking is obviously hard and most people have to try (and fail) multiple times before they break the habit for good. There's a reason Mark Twain supposedly said, "Quitting smoking is easy: I've done it thousands of times."
Telling someone to quit cold turkey is not the best strategy. There are a number of treatment options out there and we should be using them more than we currently do