My moms addicted to meth. Is it normal to have anxiety when people around me smoke pot?

My mom has been addicted to meth for 5 years now. It ruined my family and my parents divorced over that and other issues. My boyfriend smoked before he was with me, but stopped when we got together. He did three times (with me knowing) while we were together, but I began to hyper ventilate and almost have an anxiety attack .
Is it normal for children of drug addicted parents to go through such anxiety over a small thing like pot?