Party spliff

I was at a party last night when some guy passed a huge spliff to my mate Paddy and said, "Try this."

"No thanks." he replied.

"Go on." I said, "One puff won't hurt you."

"Ok," he said, taking a big drag.

"Holy " he spat, "You said it wouldn't hurt!"

I said, "Paddy,

Spoiler:

try sucking the other end."