Taking a look at dwarves.

[Kalai]

The focus of being a wealthy dwarf may entail being miserly, but it may also entail spending on finer things, because buying fine things is a manifestation of wealth and therefore potentially part of the focus. 'Wealthy people don't eat dirt tubers' is more likely the reasoning in this case than 'wealthy dwarves don't have to eat dirt tubers'. If you happen to be wealthy, and happen not to eat dirt tubers, then it is not relevant so do what increases your morale.

It may benefit your focus to adopt rules of ethics that generally apply to other people. Picked right, they make people more likely to help you, you don't have to waste mental energy figuring out how you should react to a situation. Just ignore them when they get in the way.

Pot being relaxing might make it more appealing than any recreation-based attempt to 'relax' if you need to be relaxed. Chemical effort makes more sense than distracting yourself doing stressful things that don't have any point.

Some aspects of what we consider psychopathy could manifest in even the most caring dwarf, such as a lack of remorse in certain circumstances, but none are particularly necessary. Then again the environment lends itself to diminished empathy and remorse regardless of the race of your character.