Does nicotine gum cause ageing of the skin?

Answer 1

No.

Smoking nicotine will, though. Check this out:
http://www.movingandchoosing.com/tobacco_adult.htm

ANY impact chewing nicotine gum has on your body is MUCH, MUCH, MUCH less than all the effects of smoking nicotine has!

Hope this helps,
yachadhoo