...well, at over 200mg, even with a high tolerance, one becomes an ancient piece of space wreckage, floating in the eternal void. Still no actual visual hallucinations per se, but mentally you're utter chaos, thoughts literally turn into birds and fly off away from you in your head as you try to think them, etc. It's not impossible to have hot machine sex in this state, but you really need to do all the prep work first, or it's gonna take a very long time to assume the position. Assuming you even remember what you are.... *sigh...
20mg i would hardly register...
Point being, everyone's biology is different, and you need to work out for yourself what a manageable dose is. Start small, give it a couple of hours to settle in so you can judge it correctly so you can work out the next dose. The more frequently you do it, the higher your tolerance will rise as well, if you dose everyday it will be a different experience from dosing once a week.
If you have trouble acquiring edibles, make your own. Either make a cannabutter, or some flapjacks (so easy...), then work out what quantity of that you need for what specific effect by cautious dosing. Note the quantity. Give it two hours. Judge the effect. If you still need a lift, just have a lil smoke at that point, it'll affect you more strongly than normal anyway. Then come back another day to test a different dose, when you're fresh.
Sometimes the initial rush can be unsettling, some people panic and get worried. It'll pass, it's a transition period, body is adjusting, mind is adapting. Occasionally people have very bad reactions, and get paranoid, and need to lie down on a cold floor, etc. usually a combination of inexperience, and too high a dose. If you need to come down from weedz, go eat lots of food, stuff yourself stupid, protein, veg, stuff your body needs to digest, not processed crap if possible. It very quickly knocks the stuffing out of the experience, and then you go sleep for ages.