You need to ask forgiveness of Allah and expiate for the breach of the oath, and even more importantly you need to overcome this addiction.

For details, please consult the following answers.

• My son has sworn upon The Holy Quran that he will not smoke ciggerets but he smoked .he is very sorry n asks for forgivness from Allah according to islam what must he do for Allah to for giv him
• As a Muslim convert and smoker, I find it difficult if not impossible to fast. I have been through 5 Ramadhaans and haven't successfully fasted a single one. I feel that I am getting too far behind to make up the fasts and I don't know how well I will do in this coming one. I find the fasting is not as difficult as quitting smoking. I don't know what I can do? I am finding that Islam is not an easy religion as we believe it is, or maybe it is just me.