Not Getting High O.o?

Ive been smoking more and more now and for some reason I am getting less high off the same amount of weed. Yesterday my friend rolled a dub (20 dollars worth) of weed and we took 3 hits each till it was gone and they were both blazed out of their ass and I wasn't. I used to get crazy high at first but now its different is this normal?

your tolerance may be to up, chill for a sec nd dont smoke as much weed as you do, give it a week

called tolerence and yes its normal

Ok good thanks guys.