The sequence of tenses depends on the fact they describe.

This type of sentences is simple. It does not matter at what point of time the speaker is. The rules of chapter 6 apply here fully.
When the position of the speaker comes to focus because the action described is something thought, imagined, wished or feared, the position of the speaker within the time span is important. Have a look.

We see it's not that easy anymore because we have a second dimension, the first one is the action itself and the second is the focus on the person that produces (by thinking, imagining, wishing etc.) these actions.

Case I: The sequence of actions are independent of the person thinking / talking about it
here we apply the rules of chapter 6
	1) You smoke so many cigarettes that you will fall ill of cancer.
	2) You have smoked so many cigarettes that you are ill of cancer now.
	3) If you are going to smoke cigarettes, you will fall ill of cancer.

Case II: The sequence of action is appended by the person reporting about it (by being in one                or the other way mentally involved
If the point of time of speaking and the point of time of being involved in the sequence of action NOT identical it can get a bit challenging.
	1.a) I always thought that you smoke so many cigarettes that you would fall ill.
	1.b) I will think that you have smoked so many cigarettes that you fell ill of cancer.
	1.c) I think that you smoke so many cigarettes that you will fall ill of cancer.

	2.a) I thought that you had smoked so many cigarettes that you are sick of cancer.
	2.b) I will think that you have smoked so many cigarettes that you are ill with cancer.
	2.c) I think that you have smoked so many cigarettes that you are ill with cancer now.

	3.a) I thought if you are going to smoke so many cigarettes you will fall ill of cancer.
	3.b) I will think that when you are going to smoke cigarettes, you will fall ill of cancer.
	3.c) I think that when you are going to smoke cigarettes you will fall ill of cancer.

Is the introductory verb in present tense then there is no difference between the case I and case II. This is important to realise, because it means for the Spanish grammar that the rules of chapter 6 apply when the introductory verb is in a "present" tense (presente, pretérito perfecto, futuro I und futuro II).

Is the verb in a past tense (pretérito imperfecto, pretérito indefinido, plusquamperfecto) there are rules to be taken into consideration. We will have a look at them. Ffirst to remind you; Is the involvement of the speaking person in the present (tense) there are no differences to the "normal" use of the tenses.

	1) case I: You smoke so many cigarettes that you will fall ill of cancer.
	1.c) case II: I think that you smoke so many cigarettes that you will fall ill of cancer.
	2) case I: You have smoke so many cigarettes that you are ill of cancer.
	2.c) case II: I think that you have smoked so many cigarettes that you are ill of cancer now.
	3) case I: If you are going to smoke cigarettes you will fall ill of cancer.
	3.c) case II: I think that you will smoke so many cigarettes that you will fall ill of cancer.

As was to be seen in this table there is no difference between the two cases if the introductory verb is in a present tense. Then the point of time of the involvement of the speaker and the point of time of speaking is the same.

presente (= present) pretérito perfecto (= present perfect) futuro (= future I) futuro perfecto (= future II)

It's challenging to have a introductory verb in the past tense.

pretérito imperfecto (= simple past) pretérito indefinido (= simple past) plusquamperfecto (= past perfect)

To understand the problem we have a look at this sentence

Cortaron el árbol. = They cut the tree.

The rules discussed in chapter 6 are not valid anymore. If the action is before the mental involvement of the speaker, the pretérito plusquamperfecto is to be used. Is the mental involvement at the same time the imperfecto is the right choice, with the action after the point of involvement the right tense is the condicional.

The overall the situation is this
present tenses	presente pretérito perfecto futuro futuro perfecto	The tenses are according to the logic described in chapter 6.
past tenses	pretérito imperfecto pretérito indefinido plusquamperfecto	action before involvement: plusquamperfecto action at the same time as involvement: pretérito imperfecto action after involvement and not yet finished: condicional simple action after involvement and finished: condicional compuesto

When discussing the mental involvement one could get the idea to discuss verbs that require the subjuntivo. The above is - so far - only meant for the indicativo. Furthermore, please note that verbs like suponer (to suppose), creer (to believe, to think), pensar (to think) and presumir (to assume) do not require the subjuntivo. Rather impersonal expressions of doubt require the subjuntivo.