The meth cooking will receive major update soon. The current meth cooking wasn't much fun and didn't make much sense, as meth is being cooked differently. We noted that and came up with improved cooking feature, where you will directly affect the cooking process and you also will have to watch the temperature, otherwise your small improvised meth lab could explode!
Together with this update, a brand new trailer interior will be added. You will be able to purchase special houses - trailers, which are located for example in Angel Pine, Montgomery, Fort Carson and on many other places. These trailers will have the unique interior, which will contain the new meth lab equipment and also a list of chemicals, which you will have to secure in order to being able to cook some meth!
We are also planning in adding different bonuses, which you gain using cocaine and meth, replenishing health will only remain for weed. That means every drug will have its own unique bonuses.