The poskim have spoken about this. No sooner than one would brazenly be mechalel Shabbos, or eat chazzer, should one light up a cigarette. This is straight from the poskim.
… The heter that is used to smoke on Yomtov … In Eretz Yisroel, the poskim are still debating the issue
If “the poskim” unequivocally asser smoking at any time, why would “the poskim” debate whether it’s muttar on Yom Tov?