I suggest getting help from family and possibly counselors/therapists, and/or life coaches if possible. Write down why you want to quit. Write down the pros and cons of smoking. Write and plan out activities that will replace smoking! That’s how I quit smoking weed and everything about 7/8 months ago, also watch videos on YouTube about quitting and take notes, helps a lot. Some activities I did were shooting hoops, going on walks with some water and looking at nature, time with family, focusing on school or work, yoga, gym, sauna and swimming whenever I got the chance helped too. Hope this helps.