How to smoke in your house without people knowing<br>Open a window or fireplace duct. Before you start smoking, it's very important you give the smoke an exit to escape. Without an open window or duct, the smoke will linger in the room and your health will be at risk.
Can we infer the following?
Smoking is very gross.

OPTIONS:
-- Yes.
-- It's impossible to say.
-- No.
The answer is:
It's impossible to say