Smoking a couple of cigarettes?

Well I'm turning 18 in 3 days. I like smoking and I really like the taste of some. It makes me feel good and relax. After smoking some cigarettes, I feel a huge effect on my lungs. Is that because my body is not used to them? I prefer menthols and will begin smoking. I want to smoke but I don't feel like going to a gas station or store and buying some haha.