Easiest Way To Quit Smoking Questions

Hello, I used to smoke. I started smoking in 2016 when I was 16 years old. Later in 2020 I stopped in lockdown and after that, did occasionally only until 2022. I started doing almost daily in 2022. I was doing it until jan of this year. I sometimes did 4-5 cig a day and sometimes not even one. I stopped doing smoking now with a fear of oral cancer. All of my friends smoke. Is it okay to sit with them in a smoking cafe or place? I read somewhere that second hand smoke can cause cancer. I am starting to do regular exercise but what about oral cancer? I will not smoke with them for at least a year now.