I only found resin to be worth it when I smoked schwag. Then, my friends and I liked it more than smoking our "weed". But if the quality of your cannabis is good or even decent, resin is a dirty high that doesn't do much other than provide a headache.
When we started, my friends and I would put as much brick weed as we could fit into the chambers of our bowls, and smoke the rest of our supply through them. Once about a half ounce or so had been smoked through the pipe, the weed inside would be a blackish-gray coated weed resin chunk, basically. I dubbed it "Black Magic". We used to love that shit, and considered it a treat.
Now I just smoke dank buds, and through a vaporizer. Vaporizer resin, unlike bowl resin, is actually very concentrated THC and other cannabinoids. This is because resin is just part of the smoke/vapor that you're inhaling through the piece which has condensed and/or settled on the side of it. With bowls, this is primarily combustion products of plant material and cannabinoids, many of which are toxic and irritating and tarry, and of the relatively small percentage of THC which is actually vaporized and not burned (which is the THC that gets you high; the rest is destroyed by the flame), a very small amount of it ends up being THC and other cannabinoids. But this final product is highly contaminated and is destined to be much, much weaker than what was used to produce it, unless your weed is truly schwaggy.
With vaporizers, on the other hand, the vapor consists of (if done correctly) pure cannabinoids, vaporized cleanly with none destroyed by excessive heat/flame. Not much collects on the side this way, but over time you'll get a yellowish, sometimes darkish gummy residue. If you scrape that off, you get a concentrated and extrenely potent hash-like material. In theory, this material should be 100% cannabinoids that condensed on from the vapor before they reached your lungs. In practice, a very small amount of this is usually a faint amount of smoke that was produced here and there.
But still, it's a kind of "resin" that is truly worth smoking, and in fact can be quite a treat. Yet another great feature of vaporizers
</end shameless vaporizer plug>