ive had that happen to me before and ive been smoking about 3 years now. it happened recently actually. i had my last pinch of weed adn wanted to make it worhtwhile cuz i didnt know when id be able to get more so i vaporized it in my kitchen using a skillet and pickle jar and shit. i was high about 15 minutes and i figured ok it was jsut a pinch so thats good enough for me. but then for the next three days every time i smoked a cig it would jsut kick in and id be high as shit for like 20 minutes.
thats normal... the feel of sedatation... if u r starting to smoke that will feel weird.. but it only happened to me after the first times I smoked... it hasn't happend ever since.... so don't worry