Can smoking meth cause lip swelling ?

Yes: Yes, stop smoking meth.

Never heard of: Never heard of it or expected this as part of the side effect. However there may be other ingredients mixed with the meth which can cause lip swelling and other side effects.

Please stop: It can't benefit you in any way possible. Hope this helps.

What difference?: Lip swelling may indicate allergic response to either the meth or another ingredient. But what difference does it make if you're committed to suicide as a meth addict?

Pipe burn: It is more likely that the lip swelling is a heat burn from the smoking apparatus (pipe, etc) than from an allergic reaction. That said, your drugs could be cut with virtually anything, and are likely to harm you. Please get help. Stopping the problem would be more helpful than solving the lip swelling.