So, even if you want nothing to do with cryptocurrency, you may already have exposure to it and are seeing added volatility in the stocks you hold. (moneysense.ca)
Taking on any foreign currency exposure certainly adds volatility. (researchaffiliates.com)
On the assumption that currencies will always eventually drift back to some neutral valuation, currency risk adds volatility to returns without changing the expected yearly (arithmetic) return. (canadiancapitalist.com)