Cannabis and meth, for me, go hand in hand. I keep my Snail (Lookah Snail, the best vape battery ever made. Short battery life but charges very quick, keeps your cartridges upright without worrying about it, and the voltage settings are way more effficient tham other batteries) nearby at all times. I often will smoke meth and then go rip one or two .5g bowls out of my bong (one hit per bowl, best way to use a bong), or I'll use my Yocan dab pen for concentrates, or I'll just do actual dabs or use my nectar collector for dabs. Or I'll do various different methods of smoking weed and just get absolutely blitzed
Some folks who combine meth and weed only get the worst effects of the weed like paranoia and such and it is amplified heavily by the meth. But since weed is legal here and drugs are virtually decriminalized now, I haven't gotten negative things like paranoia from weed or meth or the combo of the two once in three years
PS If you like hotrails, buy a nectar collector (sometimes called a dab straw) with a glass tip. You will never find a better tool to use. Many even come with little reclaim catches built in that perfect catch any unmelted meth powder and make it stupidly easy to scrape out and use. I do not use the same nectar collector for rails that I do for concentrates, because I am the cannabis fairy and give everyone I know hits off of all my pieces whenever I can. Don't want anyone inhaling meth residue instead of weed.
Edit: I prefer to smoke indica when combined with meth versus sativa. Sativa is less... trippy. It is also way more likely to cause negative effects like paranoia and anxiety alone, combo that with meth and you're probably not gonna have a good time. Oh and drink 100mg+ marijuana shots or sodas or whatever and, if your tolerance is reasonable, you'll have a psychedelic experience without the meth invovled. Introduce the meth to that and you are in for the wildest ride of all, in the best of ways,
Edit 2: Just thought of one last thing. Take RSO and do meth. Make sure you've eaten some fatty foods for the RSO to work to its fullest. Generally you want a piece of RSO that's the size of a grain of rice to get fucked up. I take about 5x as much when I do meth and I have yet to find any other high besides speedballs (coke + heroin via IV) that gets me that fucked up and feeling that good, Be careful though, eat the RSO without the meth first in the appropriate dose and then see how you feel. The first time almost always gets you too fucked up and you don't want to pair that with meth.