No, according to the Supreme Court, it's interstate commerce if a butterfly bats its wings and the resulting hurricane causes someone to buy a raincoat in another state.
IIRC, the actual case involved someone growing wheat their own land that they didn't even plan to sell. But since wheat was sold in interstate commerce, the court said any activity involving involving wheat could be regulated as interstate commerce.
https://www.oyez.org/cases/2004/03-1454
> The majority argued that Congress could ban local marijuana use because it was part of such a "class of activities": the national marijuana market. Local use affected supply and demand in the national marijuana market, making the regulation of intrastate use "essential" to regulating the drug's national market.