Almost no-one can honestly answer this for themselves. I think the truth is likely: 'no, I'd still order a coke at McDonald's, I'd still pick a coke up from a vending machine if I'm thirsty. But if I'm buying a takeaway sandwich, I might not also get the drink. Or if I'm in the supermarket, I might just skip that aisle.'

I'm sure it's almost completely subconscious.