I am trying to create a mod that adds smokeleaf brownies (among other things). The brownie uses the vanilla smokeleaf addiction / tolerance defs as its own (since they are both smokeleaf, similar to how Psychite is done for different drugs having the same base drug addiction). However, the Smokeleaf *Addiction & Chemical* causes Asthma and Carcinoma, not the joint item itself.
In the current implementation, my smokeleaf brownies will be forced to cause cancer and asthma, which doesn't make much sense. The Asthma and Carcinoma should be moved into the SmokeleafHigh HediffDef.