Loading and unloading Lightning channels creates separate transactions. Depending on how often an open channel is used, Lightning can increase the transaction load.
needlessly opening/closing channels also costs transaction fees, so as long as most users are rational, this wouldn't happen (too often).
Haha, good one.
Good one? It works, made a purchase this weekend ($4 stickers), channel cost $2 to create with a segwit tx.
From then I can send/receive transactions for 1 satoshi.