That head spinning isn't a normal side-effect and you don't feel ill, it goes away after you smoke regularly (don't, it's horrid to stop). It's your body reacting to a poison, once it's used to it, it doesn't react that way any more.

A few spliffs is more comparable to drinking a bottle of wine, rather than a couple of coffees or a few fags. But different. A single drag is more like have a gulp of wine. Won't get you drunk, might get a little fuzzy feeling depending on your tolerance.

I can bet you the op isn't talking about having a single puff.