Why cant i get drunk?

Ive attempted to get drunk many times, i recently downed 3/4 a bottle of 14.5% wine over the space of a hour or 2 and felt practically sober, i feel sorta dizzy but other than that nothing, i can talk, type and think totally normally. Ive had one instance of having a horrible hangover after going to a party where i drank vodka but even then i felt pretty normal the night before. I used to smoke weed daily so maybe that has something to do with it. Is there something wrong with me or am i just a heavyweight?