I think you have to connect these things to each other or the thread title doesn't make sense.

Try smoking more or less of whatever you are holding, the current level isn't working.

Royalty is right, Hotblack, you've made a right Horlicks desiato of this, but don't worry I've got your back:

If the Germans hadn't sent Lenin to Russia in 1917, there would have been no USSR and the rise of the worker wouldn't have pissed Adolf Hitler quite so much that he created the Nationalist movement in Germany which ultimately led to the outbreak of WW2 which would have steered a very different course if Chamberlain had not mismanaged matters at the outset which, of course, he wouldn't have done if Halifax had been the PM at the time, but then again it would have resulted in Britain negotiating with the Germans following Dunkirk as Halifax was keen to do, so Britain would have been overrun by the Nazis, who were not known for their ability to keep a promise at that time in history, so Germany would have ruled all of Europe and probably would have subdued the US too, probably causing the Japanese Imperial forces to administer the Pacific including the W Seaboard of the US, with a German-approved head of state in Washington DC per the Man in the High Castle (have you read it?), and this would have meant a number of different Presidents would not have served including Nixon and the two Bush generations, with the effect that the US would not have boomed post War in the way it did and the wave of liberal social revolution would not have swept across the US in the 1960s with its drug culture and free love, so birth rates in the third world would be lower, the world would be less overpopulated, and America's oil-driven foreign policy would not have been a thing, the "western Axis" would not have fooked up the Middle East, creating and enraging Al Qaeda, the World Trade Centre would still be standing.

But so what? That is not what happened.

I'll bite for the last point, which I assume brings GB out of WWII - but that is the only counterfactual. 

Hitler still invades Soviet Union on the same timetable. The winter of 1941 remains as brutal and the panzers freeze before Moscow. That same month Japan bombs Pearl Harbour and Hitler joins them in declaring war against the USA. 

Without a base in Europe the USA, throws the entire military/industrial might against Japan first whilst providing massive equipment support for the Soviets. Even with the entire Wehrmacht the sheer number of Soviet forces causes a stalemate in the East. The US establish a euro bridgehead in Morroco and Algeria (a la Operation Torch) .The A bomb is still ready to be used by Summer of 1945. 

Both Hiroshima and Dresden have the big boy dropped on them, followed a week later by Nagasaki and Munich. Hirohito sues for peace. Hitler does not but then three further atomic bombs dropped on Hamburg, Leipzig and finally Berlin combined with Russian offensives cause a military and societal collapse and the boy with one ball still in the bunker having tantrums. 

So, no 3rd Reich still continuing.

• Put the doob down you fooking befuddled junkie.