Strong to: In liquid form, Poison is strong to Fire, requiring one rank higher to turn it into it's gaseous form and causes it's effects to speed up if inhaled. In gas form, it is strong to Lightning.But it is listed under battle ranks. You'll have a hard time thinking linearly!
Next question! What are the strengths and weaknesses of Poison and Smoke?
Weak to: In liquid form, Water and Earth are good counters to contain and dilute the poison. While in gaseous form, Wind is highly effective.
Smoke
Strong to: The thickness of smoke can "choke" out a fire, effectively putting it out.
Weak to: Wind jutsus can blow smoke away, making it very ineffective and earth can spread it, thinning it out as well as containing it.