You should not have steam/white vapor in your exhaust except during warm-up in cold weather. You have a problem with the head/gasket or other related area. The steam is from water getting into the cylinders.

I fixed a similar problem on an old Ford inline 6 (very differrent from a Honda,I know);the head was cracked in #3 cyl area.

 

Replaced PCV valve and hoses and cleaned out canister on back of block. It cut the oil consumption some. Switched to 10w-30 and it also helped but in the end after leakdown and compression tests both were good, I narrowed it down to frozen oil scraper rings on piston #3. Got bad enough that it burned the exhaust valves on that cylinder. So...new motor is in now.