Not intentionally. I clean stuff like that with silicone spray and torches with metallic switches (eg wolf safety torch) with WD40.
O rings I put a wee smear of silicone grease on.
Contacts incandescent lamp contact leaf, switch leaves, -ve battery spring I put a smidgeon of paraffin wax or silicone grease on depending on the torch's ATEX status. That's once in a blue moon though.
I tried a smearing of copaslip (antiseize) on threads of a 4D mag torch (I couldn't find the conductivity figures) and it reduces performance ... a lot.
Speaking of rubber switch boots, I lost the boot off of that one.