“L’maaseh there will be people smoking on pesach/chol hamoed. Do you want them being over on two aveiros, or rather only one?”
1) Many simply don’t smoke on Pesach and some even quit as a result – ????? ????? ???????.
2) It certainly created legitimacy for smoking, especially when they advertise in some of the religious newspapers here in Israel bragging about their Hehsher,
3) At the very least there should be a disclaimer regarding general Halachik permissibly. Would anyone give a Hechser to a salmon & beef sandwich?
4) And then you of course have the issue of Chilul Hashem. Last year when they advertised the Hechsher it generated some horrible Facebook posts among secular Israelis.