New designer drug fad here to stay?

Designer drugs are becoming quite popular now. A new headshop just opened up within walking distance of my house. When it first opened up, they just sold they typical stuff, bowels, bongs, grinders and ext. I then asked him if they had any plant food or bath salts in stock. He didn't even know what it was, so I explained what it was and how they can legally sell it. I also told him about the legal smoke known as K2. I even gave him my empty plant baggie to show him what it looks like. He was like let me find out, if they allow me to sell it, Ill get it. Now a month later, he has some K2, plant food, and bath salts in stock. He even has Meow Meow. He even gave me some for free because he said he's making tons of business. He even carries mephedrone, which is the number one plant feeder. These are safe legal alternative highs compared to the illegal drugs. I been telling all my friends about the headshop and everyone loves it. The only people that don't like it are the drug dealers because now everyone just buys from the shop. I feel like a did a good deed by bringing mephedrone (Meow Meow) into my community.