How to quit smoking?

I really want to quit but I'm finding it so difficult. I started smoking June 2018. My boyfriend started 5 years ago. I'm 18, I want to quit before i end up sick. I read 1 in 2 smokers die from smoking related deaths. 50% of smokers die from it. That could be me or my boyfriend one day. I was at 25 a day but now I'm at 4-5 a day. I've tried cold turkey, 32 hours in and I was just so angry. I want him to try and quit but he just won't. Maybe seeing me quit will encourage him. Lately I've been coughing up a lot of phlegm. Vaping didn't work. The patches didn't work. Tried chewing gum. Tried slowly cutting down, that's worked but I can't get down to 3 a day. Any advice please? Thank you. No judgement please