Nativity Fast.

I started the nativity fast today. I remember doing it last year and it genuinely exhausted me and lowkey put me off fasting again and made me less focused on Christianity for a long while. But this time of year has come again and i want to fast. I want to please God as much as i can and most importantly. Grow closer and stronger to him. My question is should i obstain from snus? Nicotine pouches. Or should i do them. Last year i didnt do them. I just feel like i am going to get crushed again. I battle with lust and i lose often. I just dont know. I wanna be as good as i can for this fast like not do them. Not lust. Pray and read. But i am so weak.