Hello SC members :)
I collect worldwide stamps - both postage and revenue - although recently I've been focusing more on revenues. I am interested in excise stamps for cigarettes, tobacco, alcohol, cannabis etc which are currently in use in many countries throughout the world.
Issues for cigarettes are usually in the form of banderoles on the packaging (I believe the US states issue small stamps as well). Other types (usually self-adhesive) are commonly affixed to alcohol bottles.
Usage of these stamps is especially heavy in Eastern Europe (Russia, Ukraine, Belarus, the Baltic states etc) but they are also used in many other countries around the world (Canada, Germany, Malta, the Bahamas, the Philippines, Kenya etc)
Some examples from Malta may be seen here:

I would be interested in acquiring excise stamps from any country - so if your country uses these stamps and you smoke or otherwise have access to them I'd be interested in organizing a trade/purchase - tell me what you'd like in return; I'm sure we can work something out. :) I have some duplicates of Malta excise stamps similar to the ones in the image above if anyone's interested.
Note that I'd also be interested in recent "documentary" type revenue stamps - these are also still in use in some countries (France, India etc).