It sounds as if your engine may be sucking some oil past the rings, though it could also be that blow-by is pressurising the crankcase and blowing oil through the breather into the intake pipe. Either explanation points toward worn-out piston rings. You can make a simple check for this. Pull the starter cord a couple of times with the speed control in the stop position, to see what it feels like. Then remove the spark plug, put a spoonful of engine oil into the cylinder through the plug hole, reinstall the spark plug, leave the speed control in the stop position, and pull the starter cord a couple more times. If you can feel noticeably higher compression the second time, with the oil temporarily sealing the piston rings, it means that your rings are worn or broken and need to be replaced.
If your rings are very bad, compression could be so low that the engine won't start easily, but you may have two unrelated problems. The oil in the combustion chamber on its own is not a problem: what is a problem is if the engine is using a lot of oil, or compression is poor, or there is an objectionable amount of blue exhaust smoke, or the spark plug is getting fouled. If none of those is happening, it is usual to treat the oil in the combustion chamber as a sign of wear but not a cause for immediate action. So, the important thing is whether compression is weak and oil through the plug-hole improves it. If it doesn't, there is probably another cause for your hard starting. We can discuss that after you report on your test with oil in the cylinder.
