Is Subway trying to tell stoners that they want their business ?

Yes, they are targeting stoners. Healthy eating habits are important for munchies time too. What better way to motivate a stoner than by saying if you eat Subway you too can be an Olympic Gold Medalist?

yes. they are. you actually can tell this by looking at how much freakin lettuce they put in their. as with any green, it makes byproducts. and with lettuce, it makes alot. so if a stoner who knows about plants comes along, looking at that nice lush greeness, they will realise that they can get an easy high that does not involve nursing a plant that will die if the soil is dry