Why have I been feeling weird lately after smoking cigarettes?!

Im 17 and I just started smoking cigarettes again a couple weeks ago. I used to smoke every day and I was about up to a pack a day when I was 15 and then I got kicked out of school and didnt have access to them as much as I wanted anymore. I still smoked but just not as much at all. Now I do and I've been smoking again but lately Ive noticed that when I smoke its usually not right away, usually after like the 6th hit or something, I start feeling sort of dizzy and my head and neck feel heavy and my legs start to tingle and they feel really heavy to. And at first I thought it was the feeling you get when you first start smoking you know? You get lightheaded and a little dizzy but after the leg thing started I realized its not. And the feeling wouldve went away by now anyways. Its like if Im sitting down smoking its hard to stand up becuase I feel like Im going to fall over or something and my legs feel so weird and tingly. And if Im standing up smoking I jsut want to sit down. Its weird and kind of scaring me and I know i should try and quit but its hard. I jsut dont know if this happens to anybody else or if anybody would be able to tell me whats going on. This never happened when I used to smoke and I smoked alot. Im on birth control pills, lo sesonique, and i have been smoking alot more weed lately so I dont know if that would have anything to do with it. And i dont get that feeling when i smoke weed, just cigarettes. So if anybody has any idea whats going on, please let me know.