Not sure if this has been suggested but i think things like:
Alcohol, cigars ETC, could give small boosts to happiness maybe at the cost of energy.
Coffee, donuts, anything ‘sugary’ could give a small boost to energy, but maybe at the cost of a ‘sugar crash’ so that it cant be exploited and will remove energy after the brief boost period.
‘Addiction’ if using alcohol, tobacco, or even coffee for extended periods of times/frequently, you could become addicted and if going through ‘withdrawl’ your character becomes unhappy/less energy over time.