Not when you have a really low mass-to-surface area ratio. Think Sazed's trick in Well of Ascension. He falls at a speed comparable to that of a piece of paper. I don't think that counts as negligible.
And it would be really easy for a Feruchemist to /survive/ a Lashing into the air. Fall up really slowly and wait for the Stormlight to run out, fall really slowly back down....