how to build weed tolerance

so i really want to start back smoking weed, my boyfriend smokes A LOT and always asked if i wanted to hit but i always turned it down because of fear of being paranoid, i use to smoke once in a while before i had my son two years okay, i would be okay but when i felt the high first creepin i would freak out then calm down, i want to smoke really bad i just don’t want to throw up and have that paranoia feeling, i’ve experienced the paranoia feeling before, but i’ve also had a great time as well advice?? i know when i start smoking again it’ll probably hit me hard because it’s been so long