FWIW, feelings on tickling is very split; recipients seem to either love it or hate it, with no in between. Tickling, in a BDSM scene, is absolutely torture, and can be very triggering for some people. Some people can enjoy light tickling in a sensual/erotic manner, and still hate tickling as the primary form of sensation play in a scene.
I am definitely on the sadistic end of that spectrum.
If you try it, set up some kind non-verbal safe signal beforehand, because you may not be able to get words out.
Yeah, shocking… People will use substances until they want to quit. Unless and until the addict makes that choice for themselves, nothing is going to change. The best you can do is change their circumstances so that they want to change their lives.