How many control wards to buy as a midlaner?

I'm a support main, and lately I started playing mid (which fortunately I'm crushing right now), but as a support main, I have a habit of buying 2 control wards every time I get the chance to, and sometimes I even end up with more than 10 control wards a game on mid, way more than the support buys. I'm not too familiar with mid, and I hardly ever see midlaners buying control wards, so I'm not sure if this is a good or a bad thing. That's why I thought I'd ask you guys here, maybe some high elo midlaner on the boards can tell me. Thank you for the answer in advance! {{sticker:slayer-jinx-catface}}

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