Is it bad to smoke marj alot?

I usaly always smke eevery day if I got it.then theirs dat 1 or 2 days that I dnt have any.and wen I have it I smke like mre den 5 times a day .is it bad to smke to much and over a lng period.I first smkd wen I was 15 then I got busted at school at 16 so I had to quit for like 6 month .and now im bout to b 18 nxt month