if you live in a wet climate, there's really nothing you can do about humidity. In this case consider autoflowers (puked in my mouth a bit) to avoid the wet season, if possible. Some places are just wet year round, of course.
Bti can take care of larva of most insects in substrate. There are predator bugs you can look into, too. I can't help much with this stuff. Growing indoors so i never had to learn pest management beyond Bti, lol. Bti is a bacteria and has been safely used on your food supply for nearly 100 years or so. this only goes on the soil and watered in. it impacts larva only - mosquitos, gnats etc..
i've seen people put up an electrified wire to keep snails out, lol.
Raised benches for your pots can help a bit too.
ahh, you have 'leaf miners' too. That's what caused the squiggly line in that leaf.
there isn't one safe thing to spray on plants in flower, i don't care what the product label claims. Some stuff does break down faster than other stuff, but you really can't assume it is 'safe' to smoke even if it's 1 part per billion by harvest time. Safe for food we eat does not mean it is safe for smoking, either. Anything that is "systemic" is absolutely a no go unless you want to give yourself and other neurological problems late in life, lol - like Eagle20.