Are stimulants considered cheating?

I recently started doing a thing where I'll chug a couple energy drinks and some nutritional supplements (something like 320mg of caffeine + b complex + potassium + creatine + L-carnitine) before going into soloqueue and it's been making a NOTICEABLE difference in my gameplay lately... like... sometimes things feel like they are going in slow motion... is it technically cheating to drug myself up with stimulants and memory/focus supplements for the sole purpose of enhancing performance?
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