Oh! That would be in qb-core > shared > items.lua
Take a look at the rolling paper item:
['rolling_paper'] = {
['name'] = 'rolling_paper',
['label'] = 'Rolling Paper',
['weight'] = 0,
['type'] = 'item',
['image'] = 'rolling_paper.png',
['unique'] = false,
['useable'] = false,
['shouldClose'] = true,
['combinable'] = {
accept = {
'weed_white-widow',
'weed_skunk',
'weed_purple-haze',
'weed_og-kush',
'weed_amnesia',
'weed_ak47'
},
reward = 'joint',
anim = {
['dict'] = 'anim@amb@business@weed@weed_inspecting_high_dry@',
['lib'] = 'weed_inspecting_high_base_inspector',
['text'] = 'Rolling joint',
['timeOut'] = 5000,
}
},
['description'] = 'Paper made specifically for encasing and smoking tobacco or cannabis.'
},