Phrase: You lot should smoke less pot!

[FahadK]

You lot should smoke less pot!!

What does this line exactly means, this was written by someone while discussing recent AIR FRANCE CRASH, where everyone was giving their own views.

[Skrej]

'Pot' as used here is a slang term for marijuana. The stereotype is that heavy use of marijuana reduces intelligence.

Thus, the poster doesn't agree with the other people's views, and is sarcastically telling them to reduce their usage of marijuana as, in his/her opinion, it is reducing their ability to make intelligent statements about the crash.
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[FahadK]

Thanks buddy, your answer helps me to learn something new. Much appreciated.