that says it all right there,

you always lose a lot when working with them, even if you feel there's nothing to lose...sanity, emotional control, reality...they get into every aspect of your beign, consuming, feeding off of you and enrapturing you, keeping you so, entranced that you fail to realize that the world around you is no longer yours, but theirs. Low energy days, irrational mood swings, constant teetering between needing and fearing them...breakdown of interpersonal relationships of human sort, drugs are an easier habit to quit, and less detrimental to your emotional health, at least drugs are predictable in their techniques for gaining power over you, everything is susceptible to demonic influence and manipulation, even those that you care about, and care about you.

...they relish in all our emotions and have mastered the art of stimulating them, finding which ones drive us most strongly and stimulating that one...they become as hooked on us as we do them, and depending on whatever emotions stimulate the most energy, helps them decide on how they prey upon you...what's your driving emotion?

that's what you'll become consumed by...hate, fear, weakness, anger, depression, loss, hopelessness, jealousy, sexuality...how do you keep your energy up; meditation, earth grounding, a higher force you draw upon, certain magickal techniques?

the demonic sort require a lot of sustenance, especially to really show boat, if you are serious about working with them, figure out how to generate the energy they need, while having enough for yourself or they'll take it, and you'll have no defense, will or health to keep you, yours...that's when the relationships become dangerous.

if you want to jump into the frying pan, you will get fried.