Would smoking 20 joints a day have a bad efect on my health?

[joe-1-3]

for the last 4 months a have been smoking around 20 joints a day.
i can function fine! i'm at uni, so i just work and smoke.
i've been smoking weed for years! i have slowly been increasing my intake.
can anyone suggest a better way to smoke it? because tobacco is bad for me!