People who love vaping weed—now ‘tis your season.

Now through 4/20 and into summer, THC carts have never been cleaner, cheaper, stronger, more diverse, or more legal. More than a dozen states have adult-use sales going, and disposable THC vape cartridges are the second most popular category after flower.

Battery-powered devices that heat but do not burn cannabis oil have grown up into a multi-billion dollar, highly regulated industry.

Carts can be worth more than gold or platinum at the top end, and far cheaper than flower at the bottom. It’s a Cambrian explosion of cart species—and some of the best stuff is single-source farmed, extracted, and filled in-house, like at Archive PDX. Carts are so versatile and innocuous that you can forget you have one on you, especially if they are doing their job. Don’t forget to explore the best that carts can offer this April. Here are some of America’s coolest THC carts putting up clouds.