title: Edit stat_smooth lines AND geom_points in the same figure
body: <p>I have a graph with points from multiple levels of a categorical variable and the relevant loess smoothing lines for each level of the same variable.  I need to edit BOTH the points AND the lines as in order convert the default colour graph to a meaningful black and white graph. I can edit the points using scale_shape_manual but not the lines. The following code uses mtcars to get close to what I need. Unfortunately all the liens are the same color (red)I suspect I don't understand where these sorts of ?aesthetic? commands should be placed. Any assistance greatly appreciated.</p>
  <pre><code>c &lt;- ggplot(mtcars, aes(y=wt, x=mpg, shape=factor(cyl)))
  c + 
    stat_smooth(method=loess, size = 1, col=&quot;red&quot;) + 
    geom_point(aes(fill = factor(cyl)), size = 4) + 
    scale_shape_manual(values=c(16,22, 1))
  </code></pre>
  <p><a href="https://i.stack.imgur.com/Thuj4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Thuj4.png" alt="ggplot produced by this code" /></a></p>