paranoid about lung health

i’ve been a mj smoker since i was 14, daily since 18 (22 now). i always used a bong until last summer, now i smoke about 4-5 joints a day. i also vape nicotine daily and smoke cigarettes occasionally. how harmful is the weed to my overall lung health? can anyone share their experience with smoking (how long/often, if it’s had any negative or positive effects etc)? i am naturally a hypochondriac. i had a friend in high school who got a spontaneous pneumothorax (lung collapse) and he was a way heavier smoker than i’ve ever been, i remember he would clear whole bong bowls, most mixed with tobacco, all day everyday. he was also tall and thin which i’ve read increases your chances of this happening. ever since then it’s been in the back of my mind and i’ve been extra paranoid lately. with my current intake i would think i’m in the low risk category compared to others but i’d love to hear some first hand accounts from stoners who might have more experience than me. are there certain things that smokers do that can raise their chances of something happening to their lungs such as taking big hits, holding hits, smoking blunts with tobacco vs joints with paper etc? how can i lower this further? obviously no smoke is healthy and copd etc are always possible in the future but i’m talking more immediate risks.