unfortunately this is true. but then it isn't a true test of friendship if you wave goodbye so easily. yet if you are unable to challenge yourself by lifting a finger, then do your friend a favor and be honest about it. go from there.
Sobriety requires finding natural ways to be happy. Positivity is the key! Here are simple ways to hack into your happy chemicals: Dopamine, Serotonin, Endorphins, & Oxytocin. Remember drug addiction has reduced your capacity to produce these chemicals.