I have been smoking for maybe a year or so, and ever since I first started it has been the same: i don't feel high until hour or so after I smoke, but I can still get really high. All my friends start feeling it after one bong rip, or a few hits from a bowl, but for me no matter what I do, I feel nothing for a while, and sometimes I feel nothing at all. I dont think its a tolerance issue because I really have only been smoking once a week or so for the last year, and only socially with friends. Is there any reason for this? Is it common with other people?