If you're smokin' leaves, you aren't getting much if any THC. In other words, you're not really getting high. If you wait until the plant is done flowering, and take all the extra leaves, you can make hash if you want. But, no, smoking leaves off a vegging plant isn't going to do anything.

You need about 4,000 to 5,000 lumens per sq. ft. to grow well. Seedlings don't take up much room. Youer single plant, for instance, looks like it's in a 5" or 6" pot. You could use a single 26 watt CFL for the next week or so and be okay. It's only when the plant starts getting bigger and has more area for the light to strike that you need to up the light amount. 17,000 lumens is enough for 2 or even 3 full size plants. It's way, way more than you need right now.

And, yeah, you gotta kill the plant. But, look at it this way. Put a female near a male on your next grow. You'll get a ton of seeds. You're not a killer anymore. Now you're a daddy.