Could be nute burn or heat stress... Unfortunately, the pix are so dark on my monitor that I can't make out any of the damage.

These appear to be lower leaves, which makes heat stress unlikely unless you have heat built-up in the area just above your soil. This can occur if you use compost in your soil, or if you have heavy low growth and poor air circulation. Aiming your fan to blow near the bottoms of your plants from time to time will help either of these problems, but they don't seem to be problems for you now.

The cig-hole damage sounds like K deficiency, but if occurred a few weeks after the leaf grew as you said, and it is an older leaf, and no other leaves show this, I wouldn't sweat that one.

Some of the damage on the older leaves could simply be because they are older! Remember, when you go into flower, nutes will be sucked to the flowering areas, and older leaves will often yellow and wilt (N deficiency). This is normal.

When it comes to nutrient deficiencies, problems that show up on older leaves usually indicate Mobile Elemement deficiencies (Nitrogen, Potassium, Phosporous, Magnesium, Zinc), and new leaf troubles are often due to lacking Immobile Elements.

All in all, your plants look quite healthy. If these problems are localized, I don't think you need to worry much.

A bit of side lighting might make your beauties smile... Clamp lamps are great for this. It may give them a bit more width & bulk.

Other pix comments:

~Rooting hormone - Yep, they all say this. I think it is a CYA (Cover Your Ass) thing.

~I laughed out loud at your Moisture Meter comment. *grin*

~Remember when you mist to aim for the UNDERsides of leaves. That's where they "drink".

You're getting close to flowering time... Congrats!
mackSwell Reviewed by mackSwell on . First time grower Well, I finally did it. I saved some seeds and started my own crop (two beautiful plants) :D Everything has been going quite well except... Some of the lower leaves are showing signs of nutrient burn, or at least I think it is nutrient burn. You can check out the pictures on my flickr page here: http://www.flickr.com/photos/cannabis420/ One spot looks sort of like a cigarette burn or hole. Rating: 5